activerecord v5 support

[itsmechlark]

• Test using rails stable release & edge
• Fix Fix tests for Rails 5 #71 using Rails 5 test fix #83
• activerecord v5.1 support, Remove use of alias_method_chain #78

[itsmechlark]

In activerecord 5.1 callback under after_commit during destroy is not run since it does not exist in the _callbacks.

[bhgames]

@itsmechlark I need this for my 5.1 rails app. Is this branch stable enough to go with?

[itsmechlark]

@bhgames. Yes, if you will refer to CI Build #104.

[bplexico]

@zzak can you merge?

[zzak]

🙇 thank you! should we release this? i wonder if things break w/ v5.2

[itsmechlark]

You're welcome, @zzak! Yes, it will help those who need to upgrade to rails v5. Right now, the test against rails edge passed. BTW, thank you for merging this one. 😃