v2.0.0

• Added OpenChannel features.
  • SBUOpenChannelViewController
  • SBUOpenChannelBaseMessageCell
  • SBUOpenChannelContentBaseMessageCell
  • SBUOpenChannelAdminMessageCell
  • SBUOpenChannelUserMessageCell
  • SBUOpenChannelFileMessageCell
  • SBUOpenChannelMessageWebView
  • SBUOpenChannelUnknownMessageCell
  • SBUOpenChannelSettingsViewController
  • SBUOpenChannelSettingCell
  • OpenChannelSettingItemType
  • Added UsingUserProfileInOpenChannel to SBUGlobals
  • Added overlay themes.
• Deprecated properties in SBUChannelViewController class
  • preSendMessages
  • resendableMessages
  • preSendFileData
  • resendableFileData
  • fileTransferProgress
• Renamed classes
  • Renamed SBUMessageBaseCell to SBUBaseMessageCell
  • Renamed MessageDateView to SBUMessageDateView
  • Renamed MessageProfileView to SBUMessageProfileView
  • Renamed UserNameView to SBUUserNameView
  • Renamed MessageStateView to SBUMessageStateView
• Supported image resizing and compression
  • Added imageCompressionRate to SBUGlobals
  • Added imageResizingSize to SBUGlobals
• Improved stability.