Added disambiguation on using raw in expressions
Add 'PHP-twig for atom' package to IDEs support
minor #1426 Add 'PHP-twig for atom' package to IDEs support (zoltanradics)

This PR was squashed before being merged into the 1.16-dev branch (closes #1426).

Discussion
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Add 'PHP-twig for atom' package to IDEs support

Since Atom.io editor is growing, i would add this package to the list for people who would like to edit Twig in Atom.

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c90d469 Add 'PHP-twig for atom' package to IDEs support
fixed potential exception
fixed the deprecated docs about PEAR
fixed some deprecation notices
replaced deprecated sameas by same as in tests
replaced deprecated divisibleby by divisible by in tests
prepared the 1.16.0 release
Typo in deprecated.rst
bumped version to 1.16.1-DEV
minor #1431 Typo in deprecated.rst (barryvdh)

This PR was merged into the 1.16-dev branch.

Discussion
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Typo in deprecated.rst

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06ca7f9 Typo in deprecated.rst
minor #1333 Added disambiguation on using raw in expressions (OwlyCode)

This PR was merged into the 1.16-dev branch.

Discussion
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Added disambiguation on using raw in expressions

I recently got in trouble using the ``raw`` filter in a ternary, leading to a value being escaped and me not expecting it. The code was :

```
{{ foo|striptags|length > 250 ? foo|striptags|slice(0, 250) ~ '...' : foo|raw }}
```

When foo's length was under 250 characters, the result of this expression was escaped. Here is the updated documentation to explain why.

Commits
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cec2b57 Added disambiguation on using raw in expressions
fixed some typos
Added support for custom variables in block and parent function