Fix issue#166 alias_method_chain not working in Rails 5

[AquisTech]

Fix issue#166 alias_method_chain not working in Rails 5

Changes include:

• Use Module.prepend instead of alias_method_chain
• Combined codes from DateTimeSelect and TimelinessDateTime into TimelinessDateTimeSelect
• Modified initialize method as per latest method definition
• Removed change method as I did not find it being used for the purpose. Do let me know if it is still needed.
• Renamed value_with_timeliness to value and modified definition to use changes of Module.prepend
• Now DateTime.new(), Time.utc() or any other similar method works differently
• • Either it does not accept invalid date parameters raising error as 'invalid date' For example: DateTime.new(2018, 2, 31, 10, 16, 0) raises ArgumentError: invalid date
• • Or active_record internally converts date to next correct date For example: 31st February is converted to 3rd March
• Due to this changed behaviour, got to change the way value (datetime with errored date parameters) is passed
• Also changed param.scan(/\((\d+)\w+\)/).first.first to prettier alternative param[/\((\d+)\w+\)/, 1]

[AquisTech]

@adzap Please review changes. I am already using changes in my Rails 5.2.0 project. As Travis CI is failing please let me know changes to make tests run for Rails 5