FIX regex error in `re_yaml_schema`

there was a regex error, capturing

		#!yaml/schema
		url: 'http://some-url.com/'

	[[some-url]] is a ..

as a whole yaml structure, due to the following regex (verbosed for readability)

	re_yaml_schema = re.compile(ur'''
	                                # HEADER
	        (?:\s{4}|\t)            #   leading tab or 4 space (non-capture)
	        #!yaml/schema           #   #!yaml/schema
	        [\n\r]+                 #   new line(s)
	        (                       # CONTENT (group 1)
	            (                   #   multiple lines of  (group 2)
	                (?:\s{4}|\t)    #   leading tab or 4 space (non-capture)
	                .+              #   any string
	                [\n\r]+?        #   new line(s)
	            )+
	        )
	''', re.X)

where the 'any string' part capturing the following `\r\n`, being greedy.

this fix changes it to non-greedy: `.+?`
change regex to VERBOSE mode

- better readability
Merge branch 'FIX-schema-parse-re2' of https://github.com/jangxyz/ecogwiki into jangxyz-FIX-schema-parse-re2
Remove print
Merge branch 'jangxyz-FIX-schema-parse-re2'
Merge branch 'master' into struct-editor