Add tests for getting constants from instances.
Implement getting constants from objects.
Update documentation for constant()
Fix doc block for twig_constant.
Force timezone setting in date filter
relaxed globals management to avoid a BC break (closes #965)
merged branch markstory/object-constants (PR #961)

This PR was merged into the master branch.

Commits
-------

8bb953c Fix doc block for twig_constant.
c7dafb7 Update documentation for constant()
cb921ce Implement getting constants from objects.
998b367 Add tests for getting constants from instances.

Discussion
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Object constants

Implement the changes discussed in #954.
tweaked previous merge
prepared the 1.12.1 release
bumped version to 1.12.2-DEV
Tweak twig_constant()
[doc] Installation - recommended Composer instead of tarball
merged branch bamarni/patch-1 (PR #967)

This PR was merged into the master branch.

Commits
-------

d5de5e6 [doc] Installation - recommended Composer instead of tarball

Discussion
----------

[doc] Installation - recommended Composer instead of tarball
removed SVN instructions
Fixed typo that messes up with syntax highlighting
merged branch iamdto/master (PR #969)

This PR was merged into the master branch.

Commits
-------

9d25425 Fixed typo that messes up with syntax highlighting

Discussion
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[Documentation] Fixed typo
merged branch rybakit/constant (PR #966)

This PR was merged into the master branch.

Commits
-------

a1b7ec5 Tweak twig_constant()

Discussion
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Tweak twig_constant()

---------------------------------------------------------------------------

by Tobion at 2013-01-16T10:52:56Z

Why is it better? The old version returns earlier.

---------------------------------------------------------------------------

by rybakit at 2013-01-16T11:25:39Z

It's better for several reasons, imho:
1. Negation has gone, which is better for perception
2. Single function exit point
3. The same functionality in less code

And what do you mean by "The old version returns earlier"?

---------------------------------------------------------------------------

by Tobion at 2013-01-16T13:33:22Z

It means the old version uses a variable less and we prefer early return statements when possible.

---------------------------------------------------------------------------

by rybakit at 2013-01-16T14:24:26Z

@Tobion, but how could it be "earlier"? In both cases the ```return``` statement goes exactly after the condition check:

1)
```php
if (!$object) {                   // 1. check condition
    return constant($constant);   // 2. return result
}
```
2)
```php
if ($object) {                    // 1. check condition
    // ...
}

return constant($constant);       // 2. return result
```
Do you want to say that case 1) is faster?
tweaked previous merge
added an exception when trying to render a template when no loader has been set (closes #975)
added the first and last filters (closes #951)