travis-ci optimizations (#4870)
* move gcc 4.9 build to circleci * travis-ci update to xcode 7.3 * travis-ci limit git fetching for OSX * Makefile split firmware targets for CI * OSX ccache
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* move gcc 4.9 build to circleci * travis-ci update to xcode 7.3 * travis-ci limit git fetching for OSX * Makefile split firmware targets for CI * OSX ccache