[ticket/11345] Change font for buttons

Change font to Open Sans

PHPBB3-11345
[ticket/11345] Add Droid Sans as fallback font

PHPBB3-11345
[ticket/11345] Move css import to template

PHPBB3-11345
[ticket/11345] Wrap remote webfonts in S_ALLOW_CDN.

PHPBB3-11345
[ticket/11345] Don't include scheme, so HTTPS is used where necessary.

PHPBB3-11345
[ticket/11874] Do not always prepend the web path; only replace phpbb_root_path

PHPBB3-11874
[ticket/11874] Fix tests

PHPBB3-11874
[ticket/11703] Make jQuery CDN switch more generic.

Config variable: load_jquery_cdn -> allow_cdn
Template variable: S_JQUERY_FALLBACK -> S_ALLOW_CDN

PHPBB3-11703
[ticket/11703] Add effectively_installed().

PHPBB3-11703
[ticket/11703] Also use empty() for T_JQUERY_LINK.

PHPBB3-11703
[ticket/11874] Correct when $phpbb_root_path is appended to build_url()

PHPBB3-11874
[ticket/11703] Extend the correct migration class.

PHPBB3-11703
[ticket/11903] Speed up paging test

PHPBB3-11903
Merge pull request #1765 from EXreaction/ticket/11903

[ticket/11903] Speed up paging test
Merge pull request #1569 from bantu/ticket/11703

[ticket/11703] Make jQuery CDN switch more generic.
Merge pull request #1571 from bantu/ticket/11345

[ticket/11345] Better font for buttons
Merge pull request #1764 from EXreaction/ticket/11874

[ticket/11874] Do not always prepend the web path; only replace phpbb_root_path
[ticket/11905] 3.1.0-a1 Migration

Created a migration tips develop tool to help find the migration tree tips so
they can be copied to versions released.

With this, A1 is the only current tree tip (it depends on all other migrations).

PHPBB3-11905
Merge pull request #1767 from EXreaction/ticket/11905

[ticket/11905] 3.1.0-a1 Migration
[ticket/11867] Schema files are not created by create_schema_files.php

PHPBB3-11867