Merge dev branch into master for 0.2 Beta and Holistic Testing (Esri#24)

* Updated publishing samples to reflect changes made to source code

* Updated Publihing SDs, shp, csv samples to reflect latest API changes

* Publisher sample updates - added samples for web maps and web scene (Esri#3)

* Updated notebook title to match filename

* Added a new sample to showcase publishing web maps and web scenes

* Fixed credentials

* Updated sample titled "Using and updating GIS content" (Esri#4)

* Updated notebook title to match filename

* Added a new sample to showcase publishing web maps and web scenes

* Fixed credentials

* Updated the sample with additional examples

* Fixed credentials

* Added an example for line featuers. Added some text explaining what smart mapping is

* Additional widgets to minimize scrolling. Fixed geocoder usage following API update

* Updated geocoder usage to match API updates

* Updated the sample to match gp service update. Added a bit more text explaining the usage of gp tools (Esri#12)

* Minor - updated sample to search for desired item to add instead of a fixed index (Esri#13)

* GIS analysts - sample illustrating spatial analysis using ArcGIS Python API (Esri#14)

* Initial commit

* Furnished the sample with spatial analysis examples

* Fixes for API changes. Added summary text and elaborated a few steps (Esri#15)

* new sample to showcase big data anlaysis using NYC taxi example (Esri#16)

* Updated hurricane tracks sample to match API changes (Esri#17)

* Updated hurricane tracks sample to match API changes and added descriptive text

* updated credentials

* Updated sample to match API changes, added explanatory text (Esri#19)

* clean up sample (Esri#18)

* clean up sample (Esri#20)

* Remove usage statistics notebook as the API isnt available

This requires work on the portal backend as well as it does not yet
support ASM.

* bug fixes and added descriptive text (Esri#22)

* synced raster product sample in 05 Content Publishers folder to match that in 04 GIS Analysts and Data Scientists (Esri#21)

Thanks, @AtmaMani

* Updated Overview page - updated sample TOC (Esri#23)

* doc updates

* apidoc update for 0.2 beta release

* updated install instructions