The present application describes compounds according to Formula I, pharmaceutical compositions comprising at least one compound according to Formula I and optionally one or more additional therapeutic agents, and methods of treatment using the compounds according to Formula I both alone and in combination with one or more additional therapeutic agents. The compounds have the following general formula:
including all prodrugs, solvates, pharmaceutically acceptable salts and stereoisomers, wherein R
1
, R
2
, R
3
, R
4
and R
5
are described herein.