Fix compiler warning by removing unused variable
Fix for linux linker error.
Merge pull request #50 from est77/master

Fix for sparse_field_io link error on linux.
Fix linking issue for Boost 1.50

I'm not exactly sure why but if you don't include libboost_system linking fails with Boost 1.50. 

Here's the original error message prior to the "fix":
inking CXX executable create_and_write
/usr/bin/cmake -E cmake_link_script
CMakeFiles/create_and_write.dir/link.txt --verbose=1
/usr/bin/c++   -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4  -m64 -mtune=generic
-Wl,-z,relro  CMakeFiles/create_and_write.dir/apps/sample_code/create_and_write/main.cpp.o
 -o create_and_write -rdynamic libField3D.so.1.3 -lhdf5 -lz -lrt -lm
-lz -lIex -lHalf -lIlmThread -lImath -ldl -lboost_thread-mt
-lboost_program_options-mt
-Wl,-rpath,/builddir/build/BUILD/imageworks-Field3D-94d1bf3/build
/usr/bin/ld: CMakeFiles/create_and_write.dir/apps/sample_code/create_and_write/main.cpp.o:
undefined reference to symbol '_ZN5boost6system15system_categoryEv'
/usr/bin/ld: note: '_ZN5boost6system15system_categoryEv' is defined in
DSO /lib64/libboost_system-mt.so.1.50.0 so try adding it to the linker
command line
/lib64/libboost_system-mt.so.1.50.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
Merge pull request #51 from hobbes1069/patch-1

Fix linking issue for Boost 1.50
Merge pull request #47 from lgritz/lg-clang

Fix compiler warning by removing unused variable
Fixed the readVectorLayerAs functions
Fixed the missing flag "addFalloff" to maya syntax thanks to Lisur
Merge pull request #59 from sosh/maya_plugin

Fixed the missing flag "addFalloff" to maya syntax thanks to Lisur
Merge pull request #57 from sosh/readVectorLayers

Fixed the readVectorLayerAs functions
-Added mutex lock for the InitIO() call.
forgot to make the mutex a static varible
Merge pull request #61 from sosh/master

Added mutex lock for the InitIO() call
SparseField updates for v1.4
Bumping version to 1.4.0
Updating .so version to v1.4.0
Set soversion automatically instead of manually.
Merge pull request #66 from hobbes1069/master

Set soversion automatically instead of manually.