modtool: added comment to modtool's generated root CMakeLists.txt file to describe use of GnuradioConfig.cmake.
gitignore: git now ignores the build/ directory
Merge remote-tracking branch 'bhilburn/gitignore_fix'
blocks: Added tag gate
digital: OFDM passes all tests
utils: fix modtool template output signature
Merge branch 'maint'
Merge remote-tracking branch 'martin/master-ofdm2'