Revert "Configure travis to not use coverage and gcc4.9 during tagged…

… releases"

This reverts commit 1ee211f.

Merge pull request nodegit#867 from srajko/submodule-get-set

Submodule get set

Fix docs for `Repository#stageFilemode`

bump version

Merge pull request nodegit#835 from nodegit/fix-manual-install

Fix manual install

bump version

bump version

Update README to show 0.6.0 as stable

Merge pull request nodegit#733 from nodegit/bump-version

Bump version to 0.5.0

bump to 0.4.1