Revert "Use CodeJail with FSIZE support, and default to 50k"

This reverts commit 89c48f4a.

Conflicts:
	requirements/edx/github.txt

lms/envs/common.py

@@ -312,8 +312,6 @@ CODE_JAIL = {
     'limits': {
         # How many CPU seconds can jailed code use?
         'CPU': 1,
-        # How large a file can jailed code write?
-        'FSIZE': 50000,
     },
 }
 

requirements/edx/github.txt

@@ -9,5 +9,5 @@
 
 # Our libraries:
 -e git+https://github.com/edx/XBlock.git@b697bebd45deebd0f868613fab6722a0460ca0c1#egg=XBlock
--e git+https://github.com/edx/codejail.git@c08967fb44d1bcdb259d3ec58812e3ac592539c2#egg=codejail
+-e git+https://github.com/edx/codejail.git@0a1b468#egg=codejail
 -e git+https://github.com/edx/diff-cover.git@v0.1.3#egg=diff_cover