Add skeleton pyramid view support.

Factor out 'main_template' for use across multiple view templates.
Add support for listing employees.
Add view showing employees.
Add view showing employee reports.
Add view showing a single expense report.
Bootstrapify tables.
Improve status display for reports.
Moar readability, dammit.
Tidy.
Add employee metadata (name, created, updated).
Merge pull request #4 from GoogleCloudPlatform/add_pyramid_views

Add pyramid views