* complete rewrite to add auto detection for thirdparties libraries
* all features are enabled by default unless --without-xxx is used
* adds support for pkg-config to ease integration on other projects (tp, webrtc2sip...)
****** FIRT REVISION KNOW TO FULLY WORK WITH TP ******
- Detect support for h264, h263, theora and mp4v-es at runtime instead of using macros at compile-time
- Allows configuring audio ptime and video fps
- Adds support for congestion control
- Complete support for RTCP-REMB (http://tools.ietf.org/html/draft-alvestrand-rmcat-remb-00)
- Change way the bitrate is computed (use width, height, motion-rank and fps)
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