adds menu options for fixs usings and code format.  replaces ctrl+F12 with alt+F12 for Go To Definition, ctrl+F12 creates a character in atom on Yosemite.
request method modified to support string value returns from omnisharp endpoints - some of them don't return json
adds build capability (for msbuild/xbuild style projects or solutions).   output is displayed in build output pane, errors lines/messages in the output are clickable and navigate to error via `omni:navigate-to`
adds shortcut for build (familiar ctrl+shift+b) and build now shows the build pane when invoked.