changing to get rid of deprecation warnings

the special-purpose file resolution method for test/spec files was failing
with namespaced test files (ex. User model attributes would annotate both
test/unit/user_test.rb as well as test/unit/foo/user_test.rb, instead of
only the former)

Always load models, since they may not be autoloaded by Rails

Refactor initialization of exclude options

* update option parser
* didn't add tests b/c i'm not using rvm and can't see an easy way to add commandline option parsing tests

Use RDoc inline-code formatting

support the PostGIS adapter

Fix typo

Fix typo in rake file setting, "try" should be "true"

add option to ignore columns matching a regex with -I or --ignore-columns

fix build spec for enum

Fix composite primary keys test

Fix #113 (for encoding comments generated by magic_encoding gem)

Remove excessive newline when annotation is put after code

Attempt model annotation only if table exists

Handle array column limits

Revise the warning in the README