Command re-organisation, new features, and many bugfixes

* Improved help

* Renamed `check` command to `info`
* Added `build`, `check`, and `version` commands
* Added `detach`, `params`, and `tags` parameters to `deploy` command
* Added `creds` parameter to `info` command
* Added `detach` parameter to `rm` command
* Added `wait` parameter to `watch` command
* Many bug fixes

Add MFA support

v0.7.2

Add MFA support

Minor update to rain fmt

Format large numbers correctly for YAML where fmt.Sprint does not.

Introducing ChangeSets and squash some bugs

Use changsets for deployment
Add force flag to deployment
Add formatting and processed/original options to cat
Add force flag to rm
Add watch command
Only show short output for completed resources while watching a stack
Differentiate between objects in diffs that have children with changes and objects that have actually changed
Add two-way option to tree command
Change ls output to YAML format and remove the table library
Add -c switch to check command to display current credentials

Format

Add fmt command
Fix various bugs

v0.5.1

Bugfixes to improve behaviour of formatting (and hence cfn-format)

Add tree command

v0.5.0

Add tree command

v0.4.0: Add --long flag to diff.

Add --long flag to diff.
Improve diff formatting and ordering.
Improve log formatting.

v0.3.0

Try harder to load credentials.
Add logs command.
Add --all flag to ls command.

v0.2.2

Update dependencies and display region information when running commands