Added possibility to publish links of uploaded files, and options for replace existing files with the files with the same name that will be uploaded.
Fixed unnecessary API call for retrieving attachments.
Remove existing attachments improvement
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/main/java/com/myyearbook/hudson/plugins/confluence/ConfluencePublisher.java
Merge pull request #3 from nrudenko/master

Possibility use links of attached files in markup.  Thanks @nrudenko!