v0.5.1: improves symbol handling.
v0.5.2: skipped unessential rects and lines to make fields' bk clean
Use log function instead of console.log
Remove one more call to console.log
Merge pull request #13 from brianc/master

Remove console.log - needs to add log switch in command line later.
v0.5.3: improved logging util
v0.5.4 added verbosity control for logging
v0.5.5: extended arbitrary mask range to have 1 character special masks
v0.5.6: added 'percent' field format
Merge branch 'master' of github.com:modesty/pdf2json into merge_upstream

Conflicts:
	pdfparser.js
Fix handling of non-symbols in symbolic fonts