Add back button to second step of embed form
Populate entity select form with existing values
Set default values in form only if existing values were set
Rename form field name of back button
Fix coding standard
Add doc comment for function goBack
Use t function for value of back button
Use null instead of empty saveCallback function definition
Fix misplaced quotes
Check if existing values exist in form exist before using those
Use #default_value instead of #value to set default values from existing values
Merge pull request #27 from cs-shadow/add-back-button

Add a Back button in the second step of the Embed form