declare 'db' var in both functions

modified:   tasks/couchapp.js

added 'db' to the var list in grunt.registerMultiTask("rmcouchdb",...)
and grunt.registerMultiTask("mkcouchdb",..).

Also, Emacs got rid of some white space.  Sorry about that bit of
extraneous patching.
Merge pull request #5 from jmarca/bug/declare_db

declare 'db' var in both functions