RunTravis: added haxelibInstallGit() and haxelibRun() for less redundancy
RunTravis: slightly nicer haxelibRun()
Forgot to replace runCommand() with haxelibRun()
RunTravis: fix issue when repo name != haxelib name
RunTravis: fixed some more issues
RunTravis: and another lib where haxelib name != haxelib name
RunTravis: need to use Simn/openfl-samples
Merge pull request #2882 from Gama11/runTravis

RunTravis: added haxelibInstallGit() and haxelibRun() for less redundancy