Revert "Adding ifdef on/off for SMS support"

This reverts commit 6de642ec80cb9166d452fd3dbe8c322e2407adad.
Revert "First pass at enabling SMS via GSM shield"

This reverts commit f9b6158ea847225097ba950810dda78bb2a9c801.
Revert "Revert "First pass at enabling SMS via GSM shield""

This reverts commit 632ad1881d02b2b1ded20de87abe6690e80344c6.
Revert "Revert "Adding ifdef on/off for SMS support""

This reverts commit 35a730837090504ee6a0540f942c916118e83b0c.
Removed gprs shield libraries

I think they're taking up too much RAM - need to try with lighter
weight version