Py3-pinterest

- Fixed a bug where title was not being properly set on pins
- Added "Add note to pin" functionality
- Pin method now accepts "alt_text" that is set on the pin image as alt text useful for SEO

- Improvements in the core logic - imgVOID
- Better way of dowloading board images - vriadlee
- small issues resolved around the login

- Include pinterest.login(proxy='') param

- Fix login due to pinterest integration with google captcha
- Type ahead support, you can now use the search suggestions pinterest provides while typing to find related therms - thanks kruvatz

- visual search -> thanks RocksGarnett

- fix load pin data

Bug fixes:

- get_section_pins was not using bookmarks and larger sections could not be retrieved -> imgVOID
- book mark reset -> imgVOID
- fixed small bug in pin links where sometimes double '/' is inserted in the url

Doc and example updates:
- improved download board images
- added message explaining the search api limitations