0.7.0.0

Breaking changes:

• The NPM package purescript-spago is now deprecated. New releases will be published only to the package spago (#115, #44)
  You can install the package with npm install -g spago
• Spacchetti has been merged in the official package-set: this means that spago will now use that as the reference package-set. (#120)
  As a result of this, the command spago spacchetti-upgrade has been renamed to spago package-set-upgrade.

New features:

• Support Windows in NPM install (#121, #109)
• Add spago freeze command to recompute hashes of the package-set (#113)
• Add spago verify and spago verify-set commands (#108, #14)
• Add the --filter flag to spago list-packages, to filter by direct and transitive deps (#106, #108, thanks @kedashoe!)
• Check that the version of the installed compiler is at least what the package-set requires (#101, #107, #117, #116)

Other improvements:

• Improve the installation: do less work and print less useless stuff (#110, #112, #114)
• Skip the copy of template files if the source directories exist (#102, #105)