Fixes git command line install for a specific tag. Refs #70.
Merge pull request #74 from gradha/pr_fixes_tag_command_line_install

Fixes git command line install for a specific tag. Refs #70.
Fixes #65.
Fixes #63.
Fixes #54.
Readme improvements.
Fixes #55.

It seems that .cmd files do not work in Git bash when placed in the PATH.
What we need is a file with no file extension. From now on Nimble will
create both .cmd stubs and a stub with no file extension for each package
on Windows.
Add Github readme link to help text.
Bump version to 0.5.0
Allow 'nim' in dependency list & more s/nimrod/nim/
Fixes problems with stubs on bash.
Version 0.6.0.
Added changelog entry. Improved readme.
More thank you are in order.
Rename Nimrod to Nim in readme.
Fixed tester.
Another fix for the tester.