Added etags-table package
Changed the `M-.' key binding to first update the etags-table-alist
depending on the current value of project-root and then do tag find
Using etags-table package to auto set the tags-table-list depending on
the current file instead of having to hard-code it. Commented out
build-ctags function. Added a function
`update-etags-table-then-find-tag' that updates etags-table-alist' based
on the current value of project-root and then does the tag find.