Check system date when starting packaged Marketplace (bug 1019122)

If the device clock is too far behind the user will get a certificate
error, so let's display our own error message instead.
add Punjabi language (bug 1016125)
Change 'Not yet rated' wording (bug 1003919)

This is to disambiguate between app reviews and content ratings.
Merge pull request #469 from diox/warn-if-system-date-is-incorrect

Check system date when starting packaged Marketplace (bug 1019122)
Updated Makefile following yogafire (bug 1020500)
fabfile: add build_package and upload_package for bug 1020500
Merge pull request #483 from jasonthomas/bug1020500

fabfile: add build_package and upload_package for bug 1020500
fabfile: build_package in update before commonplace commands.
pt-PT localization

Changes to be committed:
	modified:   locale/pt_PT/LC_MESSAGES/messages.po
Merge pull request #485 from cesperanc/master

pt-PT localization
Commit from Mozilla Verbatim by user havarh.: 189 of 291 strings translated (0 fuzzy).
fr: Update french locale
Merge pull request #489 from lissyx/locale.fr

fr: Update french locale
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 291 of 291 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user havarh.: 291 of 291 strings translated (0 fuzzy).
New files added from Mozilla Verbatim based on templates
fabfile: set DJANGO_SETTINGS_MODULE env variable.
Commit from Mozilla Verbatim by user rpmdisguise-otros@yahoo.es.: 291 of 291 strings translated (0 fuzzy).
implement startup loading events (bug 1024014)
new icons; bug 1025299