Press - on first line of :Gstatus to edit .git

This is a bit silly, but provides a quick way to start navigating the
repository.  Press it a second time and you're in the work tree root.
Loosen regex to compensate for iskeyword

Closes #332.
Add foldenable to fugitive_diff_restore
Revert "Add foldenable to fugitive_diff_restore"

This reverts commit cbb7c3e89026472dfbc5440d78ce85975423bedd.
Encapsulate restore options for diff

This should make it easier to experiment with solutions for issues such
as #257.
Merge branch master into guns
Change heading style
Extract contribution guidelines
Update :Gblame explanation in README
Fix :Gstatus dp with external diff enabled

Closes #341.
Support angle quotes in git status

Closes #228.
Fix :Gmove command on Windows
Merge branch master into guns

Conflicts:
	plugin/fugitive.vim
Change if block to correct ending
Merge branch master into guns
Fix write to index with msysgit bash

Closes #388.
Don't set global foldlevel

Without this change, Fugitive will routinely overwrite the global foldlevel. It shouldn't.
Fix unmatched parens in :Gmove
Add ability to query current Git version
Work around new status style in 1.8.5

Closes #393.