Added gradle wrapper
Reorganized files
Update min API to 9 (Gingerbread).
API 8 (Froyo) is now less than 1% of active devices, and
these devices are generally too low-powered to run I2P effectively.
This allows us to move the remaining I2P jars to Java 6.
Build scripts
merge of '3a37cc3435714b0ed267c4f01159b77e1e59cd87'
     and 'b1d84ce6fa493115c9ddc12b5a5a5a62c4dadee6'
Update min API to 9 (Gingerbread)
Cleaned up routerjars