Use default cursor for .git-statusbar-item

Prevent the text selection cursor from showing on .git-statusbar-item. This is
happening because there is an   being used currently to position the
element.

Fixes #307

Small changes to improve document readabilty

Center screenshot in README

Setup Travis CI

initial travis.yml

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test script

fixes #196

need to fix layer breakers

Revert "fix build"

This reverts commit 9f5068a2.

Revert "proxy support for extensions"

This reverts commit 612efb5d.

Fix small typo