chore(travis): run two jobs

Instead of parallelization on a single Travis VM, we use two VMs.
- output is nicer (we don't have to buffer e2e tests and then show it at the end)
- you can easily see faster the result of unit tests (as it's basically a separate build)

We should also make sure we only do the necesary stuff (for install we don't need to do `grunt
package` for unit tests, we only need to generate the docs for e2e tests.
chore(scripts): refactor travis scripts

Refactoring so that it's easier to use both SL/BS just depending on a global switch.
chore(scripts): fix bower script to pull from master before updating
fix(angular-mocks): use copy of mock data in $httpBackend

Copy mock data returned from the mock $httpBackend.
This prevents modifications to the response from affecting future responses.
Previously, this misbehavior was being mitigated by the deep copy in $resource, but that no longer exists.
docs(error/transclude/orphan): fix spelling mistakes

Closes #5259
docs(ng.$rootScope.Scope): fix API links

Also added a note to the Writing AngularJS Documentation:
https://github.com/angular/angular.js/wiki/Writing-AngularJS-Documentation/d0c715ef89

Closes #5261
docs(tutorial/step-07): update path to pages in e2e scenarios

The url paths in the tutorial are not in line with the actual tutorial code

Closes #5264
docs(guide/expression): remove misplaced comma

Closes #5280
docs(ngSwitch): clarify that ngSwitch matches against string literals

Closes #5285
fix($compile): Allow literals in isolate scope references

When a component uses an isolate scope reference
and the the component is used with an object literal
a new object is created on every evaluation.
Therefore the compiler needs to compare
the values of the parent and the isolate scope
using object equality and not object reference
equality.

Fixes #5296.
fix(ngView): Add template to DOM before linking other directives

The template needs to be added to the DOM before
other directives at the same element as `ngView` are linked.

Related to #5247.
fix(ngInclude): Add template to DOM before linking other directives

The template needs to be added to the DOM before
other directives at the same element as `ngInclude` are linked.

Fixes #5247.