Minial documentation added

* sweble-wikitext d1e1e75...b975568 (1):

    commit b97556867318f39ee3630f6d3e9a027c54a58785

        Minial documentation added

* utils eff82a5...8288e15 (1):

    commit 8288e15d6b8ffc7740fa7e8e565e95ed57b968f8

        Minimal documentation added
Bug fixes in TreeBuilder

* sweble-wikitext b975568...2c75cb6 (2):

    commit 2c75cb6c8fe607c5cca67cc1ad38d6759c00fedc

        Fixed bug: HTML <img> elements crashed tree builder

    commit 6747aad1330efa4445c2e97c980c279eb916f71c

        Fixed table vs. section bugs, change in TreeBuilder behavior.