Update dependencies
Prepare for database support
Add Multicall Support

Implement multicall support by using an sqlite database to store and
retrieve calls.  Two interfaces have been added:

1) add-call.php.  Used to add calls.
example: add-call.php 15555555555 '0 10-16 * * *' 'http://www.domain.com/xml.xml'

2) create-table.php.  Creates the database file

Created calls are retrieved in the caller.php file.  Each call is run
through the scheduler to verify if it is time for it to be made.