v319 - bug fix and minor enhancements (#7)

* v319 - bug fix and minor enhancements
- fixes an error in the is_awake() property
- parameterizes the power on/ wake 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`

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v318 - fix for issue #5 bug in is_awake() property

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typos corrected and minor formatting improvements

Development (#2)

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