Cleaner code

- Removed two unused variables in PlotMe.java
- Merged 'else if' statements in PMCommand.java
- Removed unnecessary code from PMCommand.java
- Updated dependencies in pom.xml
- Added text to README.md
- Removed .idea files because not everyone uses IntelliJ. These files should not be in the GitHub Repository. 

Additions will be added below as committed. 
VaultAPI is the prefered method of implementing vault.