Add fastcache as an optional depency.  Use fastcache for travis tests
Updated to fastcache 0.4.0 api and change test splits with fastcache
Add check to ensure that proper version of fastcache is being used
Refactor tests - use fastcache by default
Add NOFASTCACHE to pypy and sphinx tests and ensure that fastcache is not used in conjuction with pypy
only test polys and plotting for 2.7 and 3.4 for GMPY and MATPLOTLIB
switch from NOFASTCACHE="true" to FASTCACHE="false"
Merge branch 'sympy_up' into fastcache_pr
Merge pull request #7737 from pbrady/fastcache_pr

Add fastcache as an optional depency.  Use fastcache for travis tests