Fixes spelling errors/docstrings.
Initial settings work.
Don't try to delete default styles if they don't exist.
shows and saves default style on layer manage style page

Addresses the issue that a default style change on the layer manage
page was not saved to Django db.
Merge pull request #1217 from cspanring/default-style-fix

shows and saves default style on layer manage style page
Finished the settings documentation.
Merge branch 'docs-work'
Spelling/docstring fixes.
Merge branch 'spelling-errors'