Improve documentation (mostly examples) + bump to version 0.2.1

Add TL.Binary.reverse_endianness/1

Update documentation for flags + bump version to 0.2.0-beta

Add tl-version of schemas 23 and 57
They're useful so they should be in the repository.

Allow to serialize with "flags"

Fix parsing of ?true flags and flags.0?TYPE

Use 2^index when parsing flags

"properly" parse flags + update to elixir 1.5

Workarounds for flags in layer 57 (TL.Build, TL.Parse)

Fix API layer 57 + defaulting to layer 57
further testing required

Add API layer 57 JSON export
Stolen from zerobias/telegram-mtproto

Fix parsing of standard gzip_packed structures

Parse "Objects" such as gzip_packed

Somewhat allow to parse future_salts

Use the README as documentation's landpage

Allow to use externel json sources for TL/API

Load the schema only once and store it in a process

Bump to version 0.0.9-alpha

Fix parsing of "messages" : get_dialogs

Fix test for changed `long` type (now signed)