* Scenario instances now have a `self.previous_scenario` attribute pointing to the last full-featured scenario (if any)
 * the runner now takes tag names
 * Scenario have now a method that matches strings

removing public content that can possibly offend people. I am fully regretful of have written something that could offend someone. Sorry :(

Verbosity level 3 in commandline causing sys.exit(2)

numerical and actual unicode characters

removing public content that can possibly offend people. I am fully regretful of have written something that could offend someone. Sorry :(

XUnit XML validation -addresses issues 207 and 201

Added missing import for traceback

os.getenv does not raise an exception when the value is not found. This ...

os.getenv does not raise an exception when the value is not found. This code fix returns (LINES, COLUMNS) when the env vars are defined, (25, 80) when they are not defined. Previously, (None, None) was returned

Reraise the exception rather than raising a copy, tests continue passing. Thanks @jtatum

Doc dev

Applied same symbols for sections in all pages of documentation, as described in docs/dev/documentation. '#' with overline for H1, '*' with overline for H2, '=' for H3, '-' for H4.