Allow compiling on Visual Studio 2012 and earlier.
update c library script: generate all message sets
Merge pull request #213 from mavlink/updateclibraryall

update c library script: generate all message sets
Updated preferred shell
Merge pull request #186 from ryancu7/master

Allow compiling on Visual Studio 2012 and earlier.
Merge remote-tracking branch 'upstream/master' into externalsetpoints