Execute link proc in instance scope

[philsturgeon]

Closes #3 thanks to awesome advice from @vasilakisfil!

[coveralls]

Coverage increased (+0.04%) to 96.04% when pulling 0a30f3f on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-51.0%) to 45.0% when pulling 13cc045 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.08%) to 95.918% when pulling 9d3e85a on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.08%) to 95.918% when pulling 9d3e85a on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.08%) to 95.918% when pulling 9828bb8 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.08%) to 95.918% when pulling ecac422 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.08%) to 95.918% when pulling ecac422 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling 8f02f5d on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling 21b8cc9 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling 1360959 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling afa11c8 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling afa11c8 on feature/instance-exec into e6d1909 on master.

[coveralls]

Coverage decreased (-0.1%) to 95.876% when pulling afa11c8 on feature/instance-exec into e6d1909 on master.