Merge tag '0.5.4' into develop

bug fix on glob
Added checks to make sure proper version of Tesseract is present
Fix for windows
Tests for coverage on tesseract
new test file
Added -n option, and improved gs testability
Marked some tests to skip on windows
Merge branch 'develop' of github.com:virantha/pypdfocr into develop
Bump to version 0.6.0 and -n option docs
Updated exe 0.6.0
Merge branch 'release/0.6.0'