GUI-1044: Initial progress on UX rework of image picker in launch instance and launch config wizards...

- Add border to image list table
- Constrain image list to display roughly four images at most
- Remove description and replace with search filter input label text
- Move image picker table above image id input field
GUI-1044: Enable direct selection of images via "Select" button in step one of launch instance and launch config wizards
GUI-1044: Handle image selection on Select button click rather than table row click
GUI-1044: Properly handle direct image ID input
GUI-1044: Update image ID input label wording to match wireframe
GUI-1044: Adjust image picker label/description based on wizard type
GUI-1044: Fix top alignment of summary area in launch config wizard
Merge pull request #760 from eucalyptus/GUI-1044

GUI-1044: UX Improvements for image picker in launch instance and launch config wizards