Adding the 'host' to the bash prompt.
Merge with github repo for:  adding bash prompt edit to .bashrc
Update README.md

Added a note about the version requirement for emacs.
Caching credentials for git.
[emacs][git] web-mode config change, git log alias change.

* Setting web-mode indent to 4 spaces.
* Adding log aliases for git.
[git] Adding --decorate to display particular branch.
Merge::'master' to Celestra