add a static linking flag
use the more standard LDFLAGS Makefile idiom for static linking
vowpalwabbit/parse_regressor.cc: better error handling on -b mismatch
parse_regressor.cc: revert exit(1) to throw exception()
Add --port_file arg to write chosen port when '--port 0'
No exception when stdin_off
main.cc: catch all exceptions in main() and do a more graceful exit.
update to 7.6.1
Merge pull request #275 from benwing/master

Add --port_file arg to write chosen port when '--port 0'
Merge pull request #274 from arielf/master

vowpalwabbit/parse_regressor.cc: better error handling on -b mismatch
Merge pull request #273 from someben/master

idiomatic -static linking hook w/ LDFLAGS
add --nondaemon option to spanning_tree.cc
close sockets when finishing parallel compute
avoid a double free
changed semantics of save_resume on test
perform close() after shutdown() in spanning_tree
allow up to 100 retries for allreduce initial connection
added sleep delay on connect error in allreduce
fixed LDA hang with minibatch 1 bug
change stride to stride_shift