test for auto elpa recipes

el-get-elpa-build-local-recipes generates recipes with bogus `emacs'
dependency.
convert elpa emacs dep to :minimum-emacs-version

Instead of producing bogus dependency on `emacs' package,
el-get-elpa-build-local-recipes should add a :minimum-emacs-version
clause instead.
Merge pull request #1478 from npostavs/auto-emacs-dep

make el-get-elpa-build-local-recipes convert elpa emacs dep into :minimum-emacs-version