Update installation.rst

Refer to PGP signature verification in the installation instructions for tarballs.
Delimit comment in template using correct syntax

Enclose the comment in '{# #}' instead of beginning line with '#'.
Added note about array_merge php function
minor #1484 Delimit comment in template using correct syntax (johnberberich)

This PR was merged into the 1.16-dev branch.

Discussion
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Delimit comment in template using correct syntax

Enclose the comment in '{# #}' instead of beginning line with '#'.

Commits
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4e1515c Delimit comment in template using correct syntax
minor #1487 Added note about array_merge php function (pulzarraider)

This PR was merged into the 1.16-dev branch.

Discussion
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Added note about array_merge php function

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT

Just a small doc improvement.

Commits
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f712b8f Added note about array_merge php function
minor #1474 Update installation.rst (soatok)

This PR was merged into the 1.16-dev branch.

Discussion
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Update installation.rst

Refer to PGP signature verification in the installation instructions for tarballs.

Commits
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3c48cb1 Update installation.rst
add PHP 5.6 to .travis.yml
minor #1492 add PHP 5.6 to .travis.yml (sasezaki)

This PR was merged into the 1.16-dev branch.

Discussion
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add PHP 5.6 to .travis.yml

Commits
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ed7004b add PHP 5.6 to .travis.yml
Merge pull request #2 from fabpot/master

Update from origin