- Major modification to the RPC messaging architecture to fully embrace
 thread-local buffers. Slightly slower per call. But much much more parallel.
 - Synchronous engine modified to use fibers.
 - To support that a fiber_barrier and a fiber_conditional had to be
 built
- Missed files in the previous checkin
- Added support for multiple buffers in the thread-local buffer to
avoid calls to realloc
Modified receiving strategy to decrease the number of calls needed to receive
Error in the push_flush implementation of the thread_local_send_buffer
 - RPC Request performance improvements: to use a more aggresive flush.
 - Reduced length of lock when extracting buffers from the thread local send buffer
Added more fine grained locks to the thread local buffer to improve parallel performance under high contention.
 - Fixed silly error in thread_local_send_buffer where a buffer is modified twice, once onsafely.
 - simplification and performance improvement of dc_buffered_stream_send
Added a barrier to the DHT performance test for reliability.
Improved buffered exchange performance slightly by ensuring more consistent flushing.
RPC:
 - Deleted some unused POD_CALL stuff.
 - Centralized all the compile time options in dc_compile_parameters.hpp
Merge branch 'master' of github.com:ylow/graphlab
Erroneous documentation for one of the parameters. SEND_POLL_TIMEOUT is in microseconds not nanoseconds
 - Added a fiber_control::fast_yield to only consider yields within the same affinity group
 - exchange now calls yield.
Minor fix in a library name in README instructions for linking GraphLab.
libevent_pthreads was missing the trailing s.
Fix a bug in distributed_graph_test
Fix graph save load binary and add unit test for this feature.
Merge pull request #34 from haijieg/graph_save_load_test

Graph Improvement
fixed documentation explaining how to run connected components
Merge branch 'master' of https://github.com/dbickson/graphlab
Merge pull request #32 from iglesias/master

Minor fix in a library name in README instructions for linking GraphLab.
Merge branch 'master' of https://github.com/graphlab-code/graphlab