Add heuristic to classify link
Add main_content extraction to SA
Merge master branch
Specify branches to build with travis
Add YAMLStor and test
Change YAMLStor signature to work directly with object
Add YAMLStor to CrawlerModule
Save structure analysis result to YAMLStor
Add log to SA. Add mark_all_as_unprocessed to crawler module
Change default config key to symbol. Add heuristic to SA
Add StructureAnalysis example
bump version to 0.0.4.pre.1
Merge branch 'prerelease'