Remove deprecated `Arel::Table.table_cache` with no replacement
Remove deprecated `Arel::Table#columns` with no replacement
Add :encode_with for proper YAML serialization
Merge pull request #196 from vipulnsward/remove_deprecated

Remove deprecated
Remove deprecated calls to `delete` with preference to using `compile_delete` and then calling `to_sql` on the resulting object to execute the SQL
Remove deprecated calls to `insert` with preference to using `compile_insert` and then calling `to_sql` on the resulting object to execute the SQL
Remove deprecated calls to `update` with preference to using `compile_update` and then calling `to_sql` on the resulting object to execute the SQL
Remove deprecated calls to using `UpdateManager` without setting `UpdateManager#key`
Remove deprecated calls to using `where_clauses`
Remove deprecated calls to `SelectManage#insert` with preference to using `compile_insert`
Remove deprecated calls to `SelectManager#wheres` with no replacement
Merge pull request #198 from vipulnsward/deprecations

Deprecations
Merge pull request #216 from iantropov/issue_yaml

Add :encode_with to sql_literal for proper YAML serialization
Don't test against Ruby 1.9.2

Rails is not testing against this version so even if arel works we can't
guarantee people application will
Remove deleted file by 9cbfc8 from gemspec
Merge pull request #217 from frodsan/remove_deleted_file

Remove deleted file by 9cbfc8 from gemspec
Update History for previous releases

Conflicts:
	History.txt
Add 3.0.3 to CHANGELOG entry [ci skip]
explicitly pass the pk to compile_update
Arel master is 5.0.0