reply to ping as per heartbeats DDP specification
added supported versions to adhere to protocol, 0.8.2 stopped letting clients connect without this
removed srp and openssl library and changed login over to meteor call and creating sha256 hash of password for non-https connections
Merge branch 'mikey0000-0.8.2'
Polish 0.8.2 support

__ObjectiveDDP__

- Update Podspec
  - Update OS platform
  - Remove Libcrypto dependency
- Remove unused SRP methods
- Remove SRP specific login retry logic
- Fix broken specs
- Delete specs that are no longer required (SRP)
- Whitespace police (update style of PR to be more inline with existing code)

__Example App__

- Update LoginViewController to be compatible with new login method callback messages
- Update example meteor app (todos) to 0.8.2