Fixed point_source_id property arguments.
Fixed set_point_source_id function call.
Changed las.LASPoint_{Set,Get}PointSourceId.restype assignment to ctypes.c_uint16 so that it matches boost::unit16_t in src/point.cpp
merge fix from https://github.com/rickhg12hs/libLAS/commit/2eca80be20e4a476a2352e5c3e980e19c913648a
merge fix from https://github.com/rickhg12hs/libLAS/commit/490c7e421effdd6581b45032fc75ce9d4448fb1f
merge fix from https://github.com/rickhg12hs/libLAS/commit/1b19da8cb6f64bc758394bbe82f6f12c862c1b64
Merge pull request #28 from rickhg12hs/master

Fixed point_source_id issues in python/liblas/{point.py,core.py}
doc updates
Merge branch 'master' of github.com:libLAS/libLAS
update FindGDAL.cmake
remove sha1.hpp in response to Debian bug showing it was non-free (really?) http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730754 It is not needed
Add new, free sha1 implementation as suggested by Francesco in Debian http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730754
Fix Debian bug http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=733282 and add system to required boost subsystems