v0.5.1

Upgrade-o-meter: just replace the .war file and restart Tomcat

Security:

• #65 - Upgraded spring-security to v4.2.3

Bugs:

• #61 - Added missing color names (*Grey + RebeccaPurple)
• #63 - Allowed "rgb(255,255,255" value for "rgb(255,255,255)" in the form
• Fixed some codacy "error prone" + "code style"

Refactoring:

• #66 - Modified project directories
• #64 - Moved contrast-finder.log|.conf files into webapp directory