Set the iOS deployment target consistently

Set it on the project level, don't override it on the target level.

Set the deployment target to 6.0 everywhere.
Include inherited header search paths in all projects
solve green issue combined with EC and multi-packet input
update binary comparison test script
Merge pull request #1151 from mstorsjo/unify-deployment-target

Set the iOS deployment target consistently
Merge pull request #1180 from huili2/dpb_green_issue_master

solve green issue combined with EC and multi-packet input
Merge pull request #1152 from mstorsjo/xcode-inherit-include-paths

Include inherited header search paths in all projects
Merge pull request #1171 from shihuade/ReleaseV2.2

update binary comparison test script
Merge remote-tracking branch 'upstream/master' into travis.android

Conflicts:
	.travis.yml