Add bitwise operators

Add in bitwise AND ".&.", OR ".|.", and XOR ".^."

Add arithmetic left shift "<<", arithmetic right shift ">>",
and logical right shift operators ">>>"

This retains the original parsing of something like "9.^.5" to be
interpreted as "square root of 9"  However, "9.^. 5" is interpreted as
"9 XOR 5".

Change-Id: I99291bed3d07d68ced204ea27bf684dc09a861fc
Merge pull request #1 from kruton/bitwise

Add bitwise operators