Ability to add custom options while connection using `ConnectionManager`

Added

• Ability to add custom options while connection using ConnectionManager

Removed

• Useless private method setConnection in ConnectionManager

Fixed

• Code readability

Deprecate plain function usage

Deprecated

• Usage of Utils/array_functions.php and will be completely deleted in next MINOR release

BulkSql feature

Added

• Optional options from $config while initializing Driver\Engine. Have more priority, then default options from Driver\Engine
• Array functions in League\Database\Utils namespace, such as:
  ⋅⋅⋅ array_is_assoc
  ⋅⋅⋅ array_depth
  ⋅⋅⋅ array_flatten
  ⋅⋅⋅ array_flatten_assoc
  ⋅⋅⋅is_array_of_type
• BulkSql feature

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* `BulkInsert`, `BulkReplace` and `BulkDelete` classes 
* `BulkSqlTrait` with `iterateOverItems` method
* `IGeneralSql` and `IBulkSql` interfaces

Fixed

• Methods return types in Utils\Transaction
• League\Database\Utils\Transaction rename method try to attempt

Removed

• hhvm support from travis-ci.yml

Base skeleton of project

2017-09-30

Added

• Driver\Engine class to set connection with DB
• Utils\Transaction class to operate with transaction in static context
• ConnectionManager wrapper class to set connection for master and slave connections