Move apps to aragon-apps

[izqui]

Apps have been moved to their own repo, aragon-apps so they can be developed along side their client code and have standard APM package structure.

What remains in aragon-core is the Kernel and common components used by apps. A decision on whether APM contracts should be moved in to aragon-core is still to be made.

This PR also removes deployment scripts and the default factory which will be added to aragon-apps or a different package.

[coveralls]

Coverage decreased (-56.7%) to 31.768% when pulling fa180e2 on remove-apps into f4e4e73 on dev.

[coveralls]

Coverage decreased (-54.6%) to 33.918% when pulling 38f133e on remove-apps into f4e4e73 on dev.

[coveralls]

Coverage decreased (-4.8%) to 83.75% when pulling dac3013 on remove-apps into f4e4e73 on dev.

[coveralls]

Coverage increased (+8.4%) to 96.875% when pulling 0616ddc on remove-apps into f4e4e73 on dev.