Adds support for building on iOS using ./ios/build.sh and from xcode#81

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TobiasWooldridge wants to merge 3 commits intoservalproject:developmentfrom

TobiasWooldridge:ios2

Commits on Aug 19, 2014

Compiles both in xcode and from ./ios/build.sh
TobiasWooldridge
committed

Commits on Sep 11, 2014

Serval builds and runs on iOS, http_server has a shim in it to disable an assertion because it's failing on iOS
TobiasWooldridge
committed
Updates build file to work with 8.0 SDK
TobiasWooldridge
committed