update gemspec version

fix variable reasolving

+ bumpup gemspec

bump up gemspec version

Fix bug in 'vars.rb'

We need to return value of 'r' instead of value of previous evaluation.

bump up gemspec

- actually start to follow semantic version
      - a.b.c   a == major, b == minor c == patch
      - c only for bug-fixes etc
      - b for non-breaking new features
      - a for breaking new featires
      - a == 0 is special, can break anywhere
      - http://semver.org

- add more specific version restrictions for gems

bump up gemspec version

bump up gemspec version

bump up gemspec version

Save stats/last status during Nodes#load

We probably should just axe Node#last, as Node#stats contains all it
does and more.
However it would need changing web views and I'm too lazy for that right
now.

Perhaps Nodes/Node also needs some unique ID so two instances of Nodes
can be compared exactly. Right now copying the old stats relies on name
being identical, but can we trust name to be unique? Even with groups
support?

Add support for node stats

Bumpup gemspec