blocks: allow the user to specify the tag key used in the tags_strobe block
modtool: dashes no longer allowed in modnames at all (fixes #619)
Merge branch 'modtool-dashes' into modtool-git
modtool: no more exit() in modtool package

Conflicts:
	gr-utils/python/modtool/modtool_newmod.py
modtool: Added git support
blocks: throttle block now looks for rx_rate tag and updates the throttle rate accordingly.  A new block parameter can tell the block to ignore these tags; set to True by default.
Merge branch 'maint'
Merge remote-tracking branch 'martin/modtool-git'