Remove old READMEs

These files seem to have been copied over from old XML courses,
and shouldn't be in our repository.

common/test/data/conditional_and_poll/README

-Any place that says "YEAR_SEMESTER" needs to be replaced with something 
-in the form "2013_Spring". Take note of this name exactly, you'll need to 
-use it everywhere, precisely - capitalization is very important.
-
-See https://github.com/MITx/mitx/blob/master/doc/xml-format.md for more on all this.
------------------------
-
-about/: Files that live here will be visible OUTSIDE OF COURSEWARE.
-   YEAR_SEMESTER/
-        end_date.html: Specifies in plain-text the end date of the course
-	overview.html: Text of the overview of the course
-	short_description.html: 10-15 words about the course
-	prerequisites.html: Any prerequisites for the course, or None if there are none.
-
-course/
-    YEAR_SEMESTER.xml: This is your top-level xml page that points at chapters. 
-    		       Can just be <course/> for now.
-
-course.xml: This top level file points at a file in roots/. See creating_course.xml.
-
-creating_course.xml: Explains how to create course.xml
-
-info/: Files that live here will be visible on the COURSE LANDING PAGE 
-       (Course Info) WITHIN THE COURSEWARE.
-    YEAR_SEMESTER/
-        handouts.html: A list of handouts, or an empty file if there are none 
-		       (if this file doesn't exist, it displays an error)
-	updates.html: Course updates.
-
-policies/ 
-    YEAR_SEMESTER/
-        policy.json: See https://github.com/MITx/mitx/blob/master/doc/xml-format.md 
-		     for more on the fields specified by this file.
-	grading_policy.json: Optional -- you don't need it to get a course off the 
-			     ground but will eventually. For more info see 
-			     https://github.com/MITx/mitx/blob/master/doc/course_grading.md
-
-roots/
-    YEAR_SEMESTER.xml: Looks something like 
-    		       <course url_name="YEAR_SEMESTER" org="ORG"  course="COURSENUM"/> 
-		       where ORG in {"MITx", "HarvardX", "BerkeleyX"}
-
-static/
-	See README.
-
-	images/
-		course_image.jpg: You MUST have an image named this to be the background
-				  banner image on edx.org
-
------------------------
\ No newline at end of file

common/test/data/word_cloud/README

-Any place that says "YEAR_SEMESTER" needs to be replaced with something 
-in the form "2013_Spring". Take note of this name exactly, you'll need to 
-use it everywhere, precisely - capitalization is very important.
-
-See https://github.com/MITx/mitx/blob/master/doc/xml-format.md for more on all this.
------------------------
-
-about/: Files that live here will be visible OUTSIDE OF COURSEWARE.
-   YEAR_SEMESTER/
-        end_date.html: Specifies in plain-text the end date of the course
-	overview.html: Text of the overview of the course
-	short_description.html: 10-15 words about the course
-	prerequisites.html: Any prerequisites for the course, or None if there are none.
-
-course/
-    YEAR_SEMESTER.xml: This is your top-level xml page that points at chapters. 
-    		       Can just be <course/> for now.
-
-course.xml: This top level file points at a file in roots/. See creating_course.xml.
-
-creating_course.xml: Explains how to create course.xml
-
-info/: Files that live here will be visible on the COURSE LANDING PAGE 
-       (Course Info) WITHIN THE COURSEWARE.
-    YEAR_SEMESTER/
-        handouts.html: A list of handouts, or an empty file if there are none 
-		       (if this file doesn't exist, it displays an error)
-	updates.html: Course updates.
-
-policies/ 
-    YEAR_SEMESTER/
-        policy.json: See https://github.com/MITx/mitx/blob/master/doc/xml-format.md 
-		     for more on the fields specified by this file.
-	grading_policy.json: Optional -- you don't need it to get a course off the 
-			     ground but will eventually. For more info see 
-			     https://github.com/MITx/mitx/blob/master/doc/course_grading.md
-
-roots/
-    YEAR_SEMESTER.xml: Looks something like 
-    		       <course url_name="YEAR_SEMESTER" org="ORG"  course="COURSENUM"/> 
-		       where ORG in {"MITx", "HarvardX", "BerkeleyX"}
-
-static/
-	See README.
-
-	images/
-		course_image.jpg: You MUST have an image named this to be the background
-				  banner image on edx.org
-
------------------------
\ No newline at end of file