Bumped version number to 3.5.1b1.
Reworded help message for sketchify command
Add CFEngine::stdlib as a dependency for sketchify-generated sketches

The current version of the stdlib sketch is obtained and used.
Added recommendations at the end of sketchify output

Details some of the things that need to be checked and maybe fixed by
hand on a newly-generated sketch.
Improve syntax of define params command.
More comprehensive search command

Now `search` looks in the entire sketch.json file for each sketch, so it
finds matches in author names, tags, descriptions, etc.
Merge pull request #367 from zzamboni/fix/misc_fixes

Miscellaneous fixes for cf-sketch