Establishes conditional compilation for all integration with the
native_tls crate in this crate. Since native_tls has been deeply
integrated into this crate for a long time, we want to maintain
backwards compatibility by making this feature part of the default.
For a consumer of this crate to "opt-out", including this in
cargo.toml:
```
[dependencies.imap]
version = 0.16.0 # Replace this with the correct version
default-features = false
```
See the conversation on Github for details on this approach:
https://github.com/jonhoo/rust-imap/issues/123
* First stab at structured types (#28)
Tests currently fail due to djc/imap-proto#2.
LSUB is also broken due to djc/imap-proto#4 (but we don't have tests for
that atm).
* Also parse out RFC822 fetch responses
* Make all the things zero-copy
* Also delegate IntoIterator for ZeroCopy ref
* Fix UNSEEN and LSUB
All tests now pass
* Address @sanmai-NL comments
* Correctly handle incomplete parser responses
* No need for git dep anymore
* Use bufstream for better read/write
* Read with length 0 == EOF
* Adapt read_delay test to write one chat at a time
* Add test for eof reads
* Neater interface for MockStream
