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.

Commits
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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
bumped version to 1.16.1-DEV