Bump Player to 1.2.13

### 1.2.13 (crafted 04/23/14)

Changes:

  * (aaronik) fixes gadgets locking for creating user upon creation
  * (Dylan Pyle) Add mouseover state for section headers in sidebar

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### 1.2.12 (crafted 04/18/14)

Changes:

  * (Dylan Pyle) Make course rail responsive for learners
  * (aaronik) updates collab-client to 0.1.13
  * (Dylan Pyle) Revert "collapsed-deleted-comments"
  * (aaronik) collapses successive deleted comments, adds tests
  * (aaronik) collapses successive deleted comments, adds tests

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### 1.2.11 (crafted 04/17/14)

Changes:

  * (Ryan) remove tray toggle
  * (rjz) Due notice when course fails to load (#1613)
  * (Dylan Pyle) Navigate to sections when they're clicked in the sidebar
  * (Dylan Pyle) lessonId/gadgetId -> lessonIndex/gadgetIndex

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### 1.2.10 (crafted 04/15/14)

Changes:

  * (Dylan Pyle) Move tracker metadata back to per-instance (fixes #1658)
  * (Jan Paul Posma) Added basic Travis CI test support

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### 1.2.9 (crafted 04/14/14)

Changes:

  * (rjz) Reassigns CourseView class onRender (#1651)

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### 1.2.8 (crafted 04/14/14)

Changes:

  * (rjz) Caches course's initial `isEditable` state (#1648)

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### 1.2.7 (crafted 04/10/14)

Changes:

  * (Aaron Sullivan) Update lesson.coffee
  * (aaronik) fixes "gadget not reordering" problem, adds test

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### 1.2.6 (crafted 04/10/14)

Changes:

  * (rjz) Revert #1637 (#1640)
  * (rjz) Revert #1631 (#1640)

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### 1.2.5 (crafted 04/08/14)

Changes:

  * (Ryan) html height fix #1633
  * (rjz) Fixes LocalModel method signatures (#1618)
  * (Ryan) deprecate tray toggle #1630
  * (Dylan Pyle) mixin -> metadata
  * (Dylan Pyle) Report gadget errors to analytics service
  * (aaronik) fixes collab related images not showing up

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### 1.2.4 (crafted 04/08/14)

Changes:

  * (rjz) More SAT launcher fixes (#1618)

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### 1.2.3 (crafted 04/07/14)

Changes:

  * (rjz) Force sync event after deferred action (#1618)
  * (aaronik) adds legacy sessionId config options to settings.coffee