Some typos, code cleanup.

Change interpretation of keyboard parameters, so that each parameter represents a button on it's own row.

introduce md tryMention

Thanks @MBoretto !

Update all keyboard commands to follow new structure.

* upstream/develop: (37 commits)
  Fix constraint error reported by @jacklul Close  #289
  Small typos and comment corrections.
  Simplify isAdmin method.
  Minor fixes.
  Various little code and comment updates.
  Refactor JSON entities array string generation. Add new helper method entitiesArrayToJson.
  Tidy up selectChats method.
  Tidy up insertEditedMessageRequest method.
  Tidy up insertMessageRequest method.
  Tidy up insertCallbackQueryRequest method.
  Tidy up insertChosenInlineResultRequest method.
  Tidy up insertInlineQueryRequest method.
  Tidy up insertChat method.
  Tidy up insertUser method.
  Tidy up insertRequest method.
  Tidy up insertTelegramUpdate method.
  DRY up getTimestamp method.
  Tidy up selectMessages method.
  Tidy up selectTelegramUpdate method.
  Simplify defineTables method.
  ...

Scrutinizer fixes

Close  #289

* upstream/develop:
  Added PHP version badge

* upstream/develop:
  Added PHP version badge

* origin/master:
  Ask if a self-signed certificate is being used. [skip ci]
  Add issue and pull request templates.
  Update inline comments for hook.php and getUpdatesCLI.php Make sure that logging is set directly after Telegram object initialisation. (thanks @jacklul for pointing this out) Proofread and update utils.md file.
  Update readme and examples for enableAdmin(s) and add an extra test for string numbers.

* origin/master:
  Ask if a self-signed certificate is being used. [skip ci]
  Add issue and pull request templates.
  Update inline comments for hook.php and getUpdatesCLI.php Make sure that logging is set directly after Telegram object initialisation. (thanks @jacklul for pointing this out) Proofread and update utils.md file.
  Update readme and examples for enableAdmin(s) and add an extra test for string numbers.

Add new helper method entitiesArrayToJson.