Added SRV DNS resolution
Merge pull request #11 from pennomi/master

Added SRV DNS resolution
Add CONTRIBUTORS section.
Update doxygen configuration.
Remove all outdated PJSIP libs and references.
Regenerate docs using newer doxygen version.
Use updated non-rebased PJSIP source commit.
Much better PJSIP compilation script and fat lib.
Adds arm64 build as well.
Misc updates for latest Xcode and Apple toolchain version.
README update.
README fixes.
Add notes about submodule clone requirement.
Adds support for sending DTMF digits. [#8]
Regenerate docs.
Add some example command for a submodule checkout.
Fix bad header search path list for release builds.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	.gitmodules
	Gossip.xcodeproj/project.pbxproj
	docs
	pjsip/.gitignore
	pjsip/lib/armv7/libresample-arm-apple-darwin9.a