IDEX-1110: validate file/folder/project/environment name on creating/renaming
Merge remote-tracking branch 'origin/master' into IDEX-1473

Conflicts:
	codenvy-ide-core/src/main/java/com/codenvy/ide/newresource/DefaultNewResourceAction.java
IDEX-1473: Error message added when creating existing file or folder
Revert "IDEX-1473: Error message added when creating existing file or folder"

This reverts commit 158f84757cfcefed4734f322ee00c4c27e693383.
Revert "Merge remote-tracking branch 'origin/master' into IDEX-1473"

This reverts commit c8388b712b9d0d1fa2a67db8d695382d01c6bae2, reversing
changes made to 10909a7f2224852839de4d2516927dfe7c38e619.
Revert "IDEX-1473: Error message added when creating existing file"

This reverts commit 10909a7f2224852839de4d2516927dfe7c38e619.
Reverted to 6367462 commit