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Release v3.2.0 (SnapKit#403)

* make 'layoutConstraints' public again (SnapKit#382)

* Fix wrong function call within contentCompressionResistanceHorizontalPriority (SnapKit#387)

* Missing property topMargin on ConstraintMakerExtendable (SnapKit#393)

This pull request adds the missing property "topMargin" to ConstraintMakerExtendable class.

* Switched main target build settings' "skip install" default settings to YES. (SnapKit#391)

* Add an isActive API to Constraint

* Priority enum (SnapKit#345)

* Adds ConstraintPriority enum to ConstraintMakerPrioritizable

* Constraints priority is now more robust

* Adds priority enum function

* Fixes compile error

* Adds failable initializer. Custom macOS medium priority. Adds back deleted methods

* Updates depracation messages

* Improve Priority API's

* Add extra protocol conformances to ConstraintPriority

* Tweak priority API's for offseting

* Tweak priority API's some more and add tests

* Prepare for release

Prepare release

Fix up iOS 9 / OSX 10.11 availability on Layout Guides

Merge branch 'master' of github.com:SnapKit/SnapKit into develop

# Conflicts:
#	Source/ConstraintMakerRelatable.swift

3.0.2 Release (SnapKit#347)

* Update ISSUE_TEMPLATE.md

* Update ISSUE_TEMPLATE.md

* Update ISSUE_TEMPLATE.md

* Update ISSUE_TEMPLATE.md

* Update ISSUE_TEMPLATE.md

* fix "Mutating a priority from required to not on an installed constra… (SnapKit#323)

* fix "Mutating a priority from required to not on an installed constraint (or vice-versa) is not supported." when the priority is not changed

* add more check when changing layout constraint priority

* add more lenient check when changing layout constraint priority

* fix UILayoutPriorityRequired available only on iOS

* fix undeclared UILayoutPriority on macOS

* add check for tvOS

* change the result constraint of maker.center.equalTo(CGPoint) to based on the original point of superview (SnapKit#336)

* change center.equalTo

* fix logic

* Add ConstraintMaker shortcuts for superview access (SnapKit#341)

Added two new shortcuts for access superview in ConstraintMakerRelatable
`greaterThanOrEqualToSuperview`
`lessThanOrEqualToSuperview`

* Add `topMargin` to constraint maker (SnapKit#343)

* Fix erroneus scheme

* Update settings for Carthage

* Prepare 3.0.2 release