Update history
Using system() instead of backticks creates an environment issue on Ubuntu where pg_wrapper doesn't work properly.
Since we're using system commands anyway, delegate up to the Postgres handler so we invoke the commands with the correct arguments.
Implement JDBC Postgres schema dumping and loading by delegating to the non-JDBC Postgres adapter.
Allow dumping the schema even if there aren't any migrations to run.
Handle an empty migrations directory better throughout.
Updated specs for improved pending migrations check.
Escape command arguments when using backticks. Also, normalize evaluated value between backticks and :system calls.
Dir.exists? doesn't exist in Ruby 1.8.7, so use File.exists? instead.
Merge pull request #52 from mogotest/postgres_rake_fixes

Postgres rake fixes
Update history and add Kevin Menard and Chris Heisterkamp to contributors
Merge pull request #53 from mogotest/no_migrations_fix

Allow dumping the schema even if there aren't any migrations to run.
Update history and bump version to 0.7.0.dev
Refactor shell command exec and add use more configuration options on database create in PostgreSQL (fixes #55)
Update homepage to point to github.io page
Reintroduce the skip_jdbc exclude filter
Update README and add some more information about features of `sequel-rails` (refs #54)
Delete unused rdoc .document file
Delete file we should not be there
Better README formatting [ci skip]