Rename project.amount -> .price

Project price seems a bit more accurate. Also moved projects link to top
bar.
Gemfile update for outdated gems

Had to add zip-zip to handle deprecation problems in RubyZip.
Project states - active, postponed, completed, dropped

Added states to project model. Limited to just active, postponed,
completed, and dropped.
Added tagging to projects

Extracted tagging into concern and added to project model.
Associated memos with projects

Not caching project titles in memos because project titles will likely
change often at the beginning of a project.
Add notes to project

On contact page, allow user to select from list of active projects to
assign the note. The note will appear on project page.
Related project contacts

Basic listing of all contacts related to a project. Also enabled select
to attach project note to a contact. All related contacts are found by
traversing the notes for people and companies.
Elasticsearch added to project

Be sure to update the elastic.yml file with projects declaration. Run
rake elastic:projects:map to set up project map.
Basic projects#index sub nav

Simple sub-nav for Projects listing to filter by state.
Improved projects subnav, fixed query forms
Basic projects