Version before some file structure changes

Introduced features:

[FEATURE] Introduced CoordinatesObj._to_dict and necessary adaptations
[FEATURE] Introduce CoordinateObj
[FEATURE] units dict in pytta.properties
[FEATURE] pytta.save() and pytta.load() functions for *.pytta files
[FEATURE] Streaming.calib_pressure method
[FEATURE] .save method for all PyTTaObj classes
[FEATURE] ChannelsList featuring on every PyTTaObj subclass
[FEATURE] Improving save methods
[FIX][FEATURE] Code improvement, added reset method to Streaming
[FEATURE] Added Streaming class and stream generator function
[FEATURE] Initial commit

Fixes:

[FIX] Array dimensions, ChannelsList passdown and typos
[FIX] freq_to_band, therefore filtering, now works for any nthOct
[FIX] Functions out of scope
[FIX] Number of colums
[FIX] Typos
[FIX] PEP8, Typos and FRFMeasure load
[FIX][EXAMPLE] Changed if statement to try-except block on exit() function
[FIX] Added stream.close() call to exit() method
[FIX] Audio player example works inside Spyder
[FIX] Typos and namings
[FIX] delete unwanted files
[FIX] .gitignore
[FIX] White spaces
[FIX] PyTTa version
[FIX][FEATURE] Code improvement, added reset method to Streaming
[FIX] classes.py fully compliant with PEP 8
[FIX] changes on imports to generate documentation
[FIX] docs and .DS file