Rp2

* Trezor plugin: AM/PM was not parsed correctly in timestamp. Fixed.
* Minor fixes

* fixed a limitation in timestamp processing in Trezor and Trezor Old plugins. The timezone that was passed to the plugin constructor could only be an ISO 8601 format offset: something like "America/Los Angeles" would not be accepted. This caused problems with daylight saving timestamps in Trezor CSV files: daylight savings time would just be ignored, thus causing Trezor summer timestamps to be 1 hour off
* updated input, input/golden, config and docs/configuration_file.md to reflect the above fix
* added pytz stubs

* added new FAQ on adding support for new wallets and exchanges
* minor fixes

* Trezor plugin: dusting attack was incorrectly interpreted as cost-only transaction. Now it issues a warning to the user
* minor fixes to documentation

* minor edits to documentation and metafiles

* fixed a few broken links in README.md (when used from Pypi only)
* fixed CLI --help description
* minor improvements to documentation