adding xtrabackup support (via innobacupex utility)
fixed explanation of MySQL backup_engine
Properly escape special characters in MySQL credentials

Previously the code could handle almost all special characters by surrounding them with a single quotes.
Unfortunately that doesn't work if the credentials contain a single quote.
Ruby already includes the shellwords library which properly escape a string for use in a shell command.
Adding param to specify which file to be used for writing logs
Merge pull request #552 from patatepartie/master

Properly escape special characters in MySQL credentials
Add travis build badge to README
Sorry I have some aggressive white space trimmers
Merge pull request #563 from marutinandanpandya/mnp_1

:log_file param
Fix twitter configuration. Fixes #525
Merge pull request #547 from chesterbr/innobackupex

Percona XtraBackup (innobackupex) for MySQL
added zabbix notifier
Merge pull request #512 from mrsn/master

Added Zabbix Notifier
Add OpenLDAP backup using slapcat
Regenerate gemspec using the release raketask
Release v4.0.3
Merge pull request #565 from idanci/openldap_support

Add OpenLDAP backup using slapcat
Add support for icon emoji configuration within the Slack notifier
Merge pull request #569 from dblandin/slack-notifier-icon-support

Add support for icon emoji configuration within the Slack notifier