Fix indentation to be consistent with FontoXML code conventions.
Add missing property/method documentation, all top level files of slimdom are now fully documented.
Rename selection folder to selections, more synchronous with mutations.
Add documentation stub for (documentation) submodule mutations and (documentation) submodule selections.
Fix a copy paste error with the nodeType constants.
Add documentation to the mutations submodule (and all it's classes).
Add documentation to the selections submodule (and all it's classes).
Add explicit @module instructions in each file for consistency and clarity.
Fix some spelling, wording and indenting mistakes/inconsistencies in several files.