Define SPARK in Makefile. Close #191
Update spark_wiring_time.cpp

Added timeStr with no arguments, using current time
Update spark_wiring_time.h

Added timeStr with no arguments prototype
Reduce size of TCPClient buffer
Updated timeStr() prototype comment
uncomment code in spark_wiring_ipaddress header
Merge pull request #212 from spark/ram-optimization/tcpclient-buffer

Reduce size of TCPClient buffer
Merge pull request #207 from Iv4nS/master

Added timeStr() function without arguments to return current time string, function uses now()
Merge pull request #219 from spark/miscellaneous-updates/ipaddress-uncomment-code

uncomment code in spark_wiring_ipaddress header
Merge pull request #193 from spark/feature/define-spark

Define SPARK in Makefile