added functionality to Compiler.get_source
strip newlines from tracebacks
simpler strip_indents
wip of haml template example
utils.indent preserves Block
haml example: handle css-selector style ids,classes
allow inserting variables into template
haml: prettier tag output
haml: handle lines starting with =,#,.
haml: fixed indentation issue
haml: handle normal text lines
haml: handle escaped text and dict-style attributes
haml: handle default void tags
haml: inlined tag line parser
utils.extract_structure handles iterators
haml: handle multiline attributes
haml: classes/ids are flattened and filtered