v0.10: Version 0.10

Changelog:
- Lots of bug fixes
- Add 'ip,ip-addr' context attribute to network contexts
- Better handling of communication timeouts on Windows
- IIOD can now stream much faster, up to the link's speed
- Fix USB backend and IIOD not handling huge buffers
- Channels are now disabled when a iio_buffer is destroyed
- Libiio/IIOD can now handle channels that share their index
- Add 'iio_attr' tool to read/write device/channel attributes