Remove clang-format use from travis
Remove clang-format use from travis

clang-format changes its output too much between versions to block
commits so go back to users being on their own for format following
the style rules.

ikeydoherty/clr-boot-manager,ikeydoherty/clr-boot-manager,ikeydoherty/clr-boot-manager,ikeydoherty/clr-boot-manager