Another unit test about environment variables expansion, plus a better string comparison.
Refactor code and prevent mstest publisher properties evolution

If the environment variables are resolved 'in place' (i.e. in the same property
of the MSTestPublisher), the graphical interface will show this value instead of
the one provided originally by the user.

Code refactoring allows a cleaner expression of the filepath resolution.
improve .gitignore
Merge branch 'master' of https://github.com/nilleb/mstest-plugin

Conflicts:
	src/main/java/hudson/plugins/mstest/MSTestPublisher.java