Merge pull request #5 from andersjohansson/master

Some changes to allow for choosing translator
New system to set translators.

 - variable zotexo-default-translator holds the name of the default/current translator
 - variable zotexo-translators hold all available translators
 - function zotexo-set-translator interactively changes the default translator
typo
remove dependence on reftex
zotexo--read accepts the ido default
remove compilation warning on parent group
added all(?) default zotero translators + improved handling of file extensions
Update README.md
updated README.md
Renamed zotexo into zotelo
rename all zotexo-* elements into zotelo-*
renames in readme
cosmetics
preparing for package.el -- added commentary and autoloads
tweaking header
adjusting autoloads
silent compiler
more informative messages
on update auto revert bib file if open (make reftex recognize the changes)
Added documentation on using Melpa package archive.