Modify syntax and ast definition for adding support of section spec.
Syntax: seperate selection, blank filling, reading, matching.
Add rules for parsing text completion and writing.
Treat (Chinese）as SYMBOL, so that its meaning doesn't depends on its context.
Rename extract-content.py to extract.py
Add script for tagging each sections.
Ignore backup files.
Add parsing rules for answer section.
Remove comments in build.xml
Add message in labeling script.
Fix typo
Refactor extract.py.
Remove extract-content.py in papers folder
Clean dist folder as well.
Add index matching rule.
Output preprocessed text in utf8 encoding.
Fix parenthesis parsing bug in extract.py
Merge pull request #1 from leimou/section_support