build v319 - bug fix and minor enhancements (#7) (also response to issue #6)

• fixes an error in the is_awake() property (issue #5)
• parameterizes the power on/ wake from sleep delay
• adds additional SH1107 commands to the constructor start-up sequence (all set to defaults)
• amends the DC-DC converter setting to the SH1107 power on reset default of 0xad81 from 0xad8d

• Delete sh1107 demo code i2c.py
• Delete sh1107 demo code spi.py