Run astyle on src/ and include/ files
Update required boost version to 1.53

Update root CMakeLists to require boost 1.53, which is now required as
discussed in #170.
Merge pull request #172 from gadomski/update-boost-version

Update required boost version to 1.53
Merge pull request #171 from gadomski/astyle

Run astyle on src/ and include/ files
put hex generation in destructor of iterator -- it has to happen after we've read all the points, and then it will update the metadata of the PointBuffer that was used to instantiate the interator
Merge branch 'master' of github.com:PDAL/PDAL

Conflicts:
	src/filters/HexBin.cpp
fix up bad merge
Use a pdal-namespaced string_ref instead of the one from system boost which is in flux right now #173
Merge pull request #173 from PDAL/issues/173-embed-string_ref

string_ref and external boost 1.53 is no good