Fixed $MONITOR_PORT detection, thanks choffmann
Merge pull request #214 from sej7278/master

Fix $MONITOR_PORT detection, thanks choffmann

Fix #213
Really fix $MONITOR_PORT detection

Fixes issue #215
Merge pull request #216 from sej7278/master

Really fix $MONITOR_PORT detection. Fix #215
Added quotes around greps/cats to help alleviate possible problems
with spaces in directory/file-names.

Removed $TARGETS as it was an unsafe wildcard and was only used
in "make clean" which itself has been simplified to just delete
the $OBJDIR rather than waste time deleting individual files.
Merge pull request #217 from sej7278/master

Quote/regex/wildcard audit (fixes issue #192)
Build core objects in subdirectory, fixes issue #82
Merge pull request #218 from sej7278/master

Build core objects in subdirectory, fix issue #82 and fix #218
Merge branch 'master' of https://github.com/sudar/Arduino-Makefile into update
Merge branch 'update'
Merge branch 'master' into professional-users