OPAL-2362: Post install page improvements/suggestions

This is what I suggest for the post install page:

When no database exists:
Before
![image](https://f.cloud.github.com/assets/2565497/2173536/05b1f378-95a3-11e3-8bfe-d4597e1f5a85.png)
After:
![image](https://f.cloud.github.com/assets/2565497/2173539/0ba04cbc-95a3-11e3-8dc5-190e2ecda494.png)

After adding identifiers database:
Before:
![image](https://f.cloud.github.com/assets/2565497/2173540/1b0b66e6-95a3-11e3-8b5c-6615689c451b.png)
After:
![image](https://f.cloud.github.com/assets/2565497/2173545/2b3d1b18-95a3-11e3-9700-31ac9f06422f.png)


After adding data database:
Before:
![image](https://f.cloud.github.com/assets/2565497/2173554/36870f2e-95a3-11e3-8d24-f7c0f7e8595e.png)
After:
![image](https://f.cloud.github.com/assets/2565497/2173559/4a87ac04-95a3-11e3-8208-b5891689b9e4.png)