* OMB - Major Refactor

- Aliases and completions now works like plugins (need to enabled in .bashrc)
- Removed the compatible check in spectrum.sh, OMB now works with Bash v3.x like the old days.
- Removed core plugin, added those bash functions into base.sh and load during startup.
- Updated OSH template for new installations
- Added history config and few other stuff from #17

@TODO: Added a shell script to update old version of .bashrc to new one.

* Fixed ShellCheck issues

* Fixed ShellCheck issues

set "function" before append_prompt_override in line 521 so that bash could known the comman

* Fix to check bash version before install

* Fix for non-zero exit status

Some environments have stringent security features that do not allow the
execution of functions inside `$PROMPT_COMMAND`, breaking every individual
theme.

We now allow the overriding of the prompt setter command to workaround
this.

Add 'bu' function to CD up faster

Only execute oh-my-bash on an interactive shell in .bashrc

First version of AWS plugin

Git plugin readme

Added README file for bashmarks plugin

Fixed issue #11

Fixed noise by rerouting the output of some external completion 

Fixed noise by rerouting the output of some external completion scripts to /dev/null fixing: ISSUE #2 from the master repository.

Fixes #4

Since spectrum.sh was copied from zsh, the typeset -A used is zsh specific and in bash4, it is declare -A. I've fixed it and I've added a check to error out with a readable message, in red color, to tell the user to upgrade bash.

- Fixed LSCOLORS from theme-and-appearance.sh
- Fixed ii() command in core plugin
- Stop using .bashrc as Oh-My-Bash profile, use .bash_profile instead
- Automate backport new version for old version users
- Added .editorconfig for future contribution

 * Implement aliases, completion in oh-my-bash
 * Added default themes from Bash-it
 * Fixed few issues