Release 0.15.1

[ptomasula]

This PR contains enhancements to the StreamWatch Schools forms and documentation. For additional detail see milestone 31.

New Features

• Updates StreamWatch schools logo in several locations throughout the application.
• Revises the StreamWatch Schools section of the home page, clarifying instructions and improving navigation.
• Adds new query parameters to the browse sites page to allow users to preselect specific programs, organizations, and site types.
• Adds filterable search feature to assessor select element on main StreamWatch Schools form
• Adds support for site photo uploads to StreamWatch Schools form
• Adds non-detect and range validation to chemical constituents
• Adds new macro invertebrates subform to the StreamWatch Schools form
• Updates StreamWatch summary table to include select parameters