GHC 7.6.x support.

Acked-by: Austin Seipp <mad.one@gmail.com>
Fix GHC 7.6.1 warning

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Version 2.1.0.0

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Add John to AUTHORS.txt

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Update .gitignore

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Revert "Fix GHC 7.6.1 warning"

This reverts commit b25e19ce91cc5dc316ac5eafccb8639dc102aa3f.

Should fix build failures for Travis-CI and pre-7.6.1 compilers.

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Simplify .travis.yml

Signed-off-by: Austin Seipp <mad.one@gmail.com>
Version 2.1.0.1

Signed-off-by: Austin Seipp <mad.one@gmail.com>
[vacuum-graphviz] Relax dependency

Signed-off-by: Austin Seipp <mad.one@gmail.com>
[vacuum-graphviz] Version 2.1.0.1

Signed-off-by: Austin Seipp <mad.one@gmail.com>