updated certificates in tests/_samples and added script to update

removed encrypt.p12 and sign.p12 as these are not used
minor #396 fixed GH-395 - failing test discovered (sstok)

This PR was merged into the master branch.

Discussion
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fixed GH-395 - failing test discovered

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #395
| License       | MIT

Updated certificates in tests/_samples and added script to update them.

The new certs are valid for 4 years, best would be to create them for every test run but VM's have a tendency to not provide enough random entropy.

Commits
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3640c06 updated certificates in tests/_samples and added script to update
added .gitattributes to fix wrong line-endings for crt, key and srl
bug #397 added .gitattributes to fix wrong line-endings for crt, key and srl (sstok)

This PR was merged into the master branch.

Discussion
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added .gitattributes to fix wrong line-endings for crt, key and srl

Commits
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f79bb9f added .gitattributes to fix wrong line-endings for crt, key and srl
Change preg_replace /e to preg_replace_callback
to avoid a deprecated warning in test-suite
Remove filter when unbinding

Solves Bug #400 #252 and possibly others
Use variable name more consistent with other input streams for unbind functions
bug #401 Double dot bug (xdecock)

This PR was merged into the master branch.

Discussion
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Double dot bug

Found this long standing bug cause, it was not caused by "_doWrite" but by the "_unbind" call

Should solve the issue.

Other changes are :

* variable name consistency and a deprecated warning rewriting

Commits
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15f271b Use variable name more consistent with other input streams for unbind functions
99c00e4 Remove filter when unbinding
e8876da Change preg_replace /e to preg_replace_callback to avoid a deprecated warning in test-suite
updated CHANGELOG
Add Travis
minor #394 Add Travis (cordoval)

This PR was squashed before being merged into the master branch (closes #394).

Discussion
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Add Travis

This PR can be merged as it is, added basic travis.

Later PRs can concern about fixing test glitches and further composer automation.

Commits
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13cd75c Add Travis
updated CHANGELOG
prepared the 5.0.3 release
bumped version to 5.0.4-DEV
Merge branch 'master' of github.com:swiftmailer/swiftmailer