Upgrade to PHP 7 and fix SSH2 Resource Bug

[michaeljoelphillips]

This PR upgrades the application to PHP 7 and Symfony 3.2 as well as incorporating Unit Tests as reported by TravisCI and CodeCov.

Fixes #1 thanks to: Herzult/php-ssh#63.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ae81df7). Click here to learn what that means.
The diff coverage is 86.66%.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   75.38%           
  Complexity        ?      164           
=========================================
  Files             ?       18           
  Lines             ?      516           
  Branches          ?        0           
=========================================
  Hits              ?      389           
  Misses            ?      127           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
src/AppBundle/Factory/LinodeApiFactory.php	85.71% <ø> (ø)	3 <0> (?)
src/AppBundle/Model/MigrateConfig.php	80% <ø> (ø)	17 <0> (?)
src/AppBundle/Service/LinodeIpService.php	0% <0%> (ø)	3 <1> (?)
src/AppBundle/Form/MigrateType.php	100% <100%> (ø)	2 <0> (?)
src/AppBundle/Service/LinodeAvailService.php	100% <100%> (ø)	4 <1> (?)
src/AppBundle/Service/LinodeHostService.php	43.75% <100%> (ø)	7 <1> (?)
src/AppBundle/Form/CloneType.php	100% <100%> (ø)	3 <1> (?)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ae81df7). Click here to learn what that means.
The diff coverage is 86.66%.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   75.38%           
  Complexity        ?      164           
=========================================
  Files             ?       18           
  Lines             ?      516           
  Branches          ?        0           
=========================================
  Hits              ?      389           
  Misses            ?      127           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
src/AppBundle/Factory/LinodeApiFactory.php	85.71% <ø> (ø)	3 <0> (?)
src/AppBundle/Model/MigrateConfig.php	80% <ø> (ø)	17 <0> (?)
src/AppBundle/Service/LinodeIpService.php	0% <0%> (ø)	3 <1> (?)
src/AppBundle/Form/MigrateType.php	100% <100%> (ø)	2 <0> (?)
src/AppBundle/Service/LinodeAvailService.php	100% <100%> (ø)	4 <1> (?)
src/AppBundle/Service/LinodeHostService.php	43.75% <100%> (ø)	7 <1> (?)
src/AppBundle/Form/CloneType.php	100% <100%> (ø)	3 <1> (?)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ae81df7...c7fd1d9. Read the comment docs.