Merge pull request #35 from nadako/development

[ereg] Mention matchedLeft/matchedRight, update implementation info (closes #14)
Merge pull request #36 from nadako/development

json (closes #22)
remove pdf again
fix error line reporting in converter
add missing labels, fix parser
[ereg] move examples into separate assets, make them complete programs, slight rewording
[ereg] describe EReg creation, slight editing