Renames context to target
Renames app_context to context.
Bumps the version
Updates readme.md
Renames get_authorization_resource to load_before and get_resource to
load_after.
Improves readme.
Further improvements to README.md
Further improvements to README
Minor adjustments to README
Adds the authorization resource sub-section.

Also fixes typos.
Minor adjustments
Merge pull request #14 from vicentealencar/master

Updates readme and improves API