Enhance sniffs with tab support

Affected sniffs:
- ItemAssignment
- FunctionCallSignature
- FunctionDeclaration
- MultiLineCondition
- ScopeIndent

Closes #58
Made ClassDeclaration sniff error-prone to malformed PHP file
Remove "ObjectOperatorIndent" sniff because it caused fixing loops
Merge branch 'master' into in-portal

* master:
  Remove "ObjectOperatorIndent" sniff because it caused fixing loops
  Made ClassDeclaration sniff error-prone to malformed PHP file
  Enhance sniffs with tab support