Correct ctags params, add note about Exuberant Ctags
Correct note about Exuberant Ctags.
Merge pull request #204 from kostafey/master

Correct ctags params, add note about Exuberant Ctags
Use file-relative-name where appropriate
[Fix #207] Use relative paths for ctags excludes
Improve calculation of ignored files/dirs
Fix a couple of incorrect let expressions
Display active project in the modeline
Fix a typo
Docstring improvements
Remove unwanted trailing slash for ctags exclude items.