Remove deprecation warnings

Remove find_or_initialize_by_* deprecation warning

Currently, Active Record recognizes the table in the string, and knows
to JOIN the comments table to the query, rather than loading comments in
a separate query. However, doing this without writing a full-blown SQL
parser is inherently flawed. Since we don't want to write an SQL parser,
we are removing this functionality. From now on, you must explicitly
tell Active Record when you are referencing a table from a string:

    Post.includes(:comments).where("comments.title =
'foo'").references(:comments)

Conflicts:
	app/models/rubygem.rb
Remove deprecated options from relationships
Update user query
Merge pull request #816 from arthurnn/rm_deprecations

Fix deprecations