fast-render break Meteor v1.5 under IE11 bugfix

[theosp]

Note, since this repository is no longer maintained, the fix below and another fix to issue #12 were published in the package: meteorspark:fast-render .

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In Meteor v1.5.0, unlike previous versions, Meteor._localStorage is a
direct reference to window.localStorage.

IE11 (earlier IE versions weren't checked) doesn't handle attempts to
replace methods of window.localStorage with different functions properly.
Such attempt will result in the String of the function we try to set
saved as the function, destroying the ability to use this function.

I couldn't find a way to tell in advance whether an attempt to set window.localStorage
will result in correct function write or not (I intentionally avoid browser
version detection, which is considered a bad practice). If such attempt will fail
we won't have a way to restore the original function.

Note 1, the situation is even worse than that. If for exapmle we'll try to set
window.localStorage.setItem = function () {} the String value 'function () {}'
will be saved instead of the function - not only for the current session, but
as part of the localStorage (!) meaning that we'll have to ask users affected by
this bug to clear the cache to fix the situation.

Note 2, the following won't work:

Meteor._localStorage = window.localStorage // Just to make example clear.
originalSetItem = Meteor._localStorage.setItem
Meteor._localStorage.setItem = function () {}
Meteor._localStorage.setItem = originalSetItem

typeof Meteor._localStorage.setItem -> string

I therefore decided to bring back the original pre-Meteor v1.5.0 code of
Meteor._localStorage below which isn't a reference to window.localStorage