prep release for 1.x branch

[Xylakant]

before moving forward with BC-incompatible changes we should create a last release of the 1.x version and then bump the major version. There have been several relevant changes since the 1.3.0 release, among the, support for opennebula 4.14. see v1.3.0...1dcefbf

[Xylakant]

I created a branch of the current master.

[Xylakant]

tagged release 1.4 on GH, needs to go to the forge as well.

[Xylakant]

The last release on the forge is 1.2 which is a tad outdated :(