Adds regex option to exclude matching class names from import list

[fxg42]

I needed a way to prevent some classes from being added to to import list -- specifically lombok.experimental.var. This lets me add the following in my .vimrc

" Prevent `lombok.exprimental.var` from getting added to the imports
let g:JavaComplete_ExcludeClassRegex = 'lombok\(\.experimental\)\?\.var'

[artur-shaik]

Thanks