Show installed Mozilla Sync version in admin panel

Closes #64.
Merge branch 'show_app_version' into v1.3
Merge branch 'master' into v1.3
Add admin page feeback

Show a notification when the settings on the admin page have been
changed.

Fixes #60.
Merge branch 'settings_change_feedback' into v1.3
Enable authentication app for LDAP

Enable authentication app for LDAP backend authentication to work.

See #23.
Merge branch 'master' into v1.3
Harmonize size calculation with Firefox browser

Use base 1024 for k, M, G,... instead of base 1000 (SI units). This
results in harmonized size display with the Firefox browser.

The relevant functions in Firefox are:
* [gSyncQuota.loadData()](http://hg.mozilla.org/mozilla-central/file/9e03cd21db08/browser/base/content/sync/quota.js#l27)
* [DownloadUtils.convertByteUnits()](http://hg.mozilla.org/mozilla-central/file/9e03cd21db08/toolkit/mozapps/downloads/DownloadUtils.jsm#l452)

Fixes #58.
Merge branch 'harmonize_quota_usage_size' into v1.3
Merge branch 'master' into v1.3
Merge branch 'ldap_fix' into v1.3
Merge branch 'v1.3'
Read new language strings
Bump version to 1.3