Retry loading resource if it starts with a slash

Resource names starting with a slash indicate that people
are confused about how Liquibase loads included files, and
that's ok - they shouldn't have to think about it. In case
files are written with a slash, this patch retries the
load without the leading slash.
[CORE-1343] Fix relative path and catch UnknownChangelogFormatException
added support for generateChangelog on DB2iSeries
remove unnecessary @Override annotations
provide support for spring classpath*: prefix
Trying to get vagrant to install databases including oracle with puppet
Ignore downloaded zip files
support mysql remarks in tage <createTable> <column> <renameColumn> <addColumn> and fix addColumn method ambiguous error in CreateDatabaseChangeLogTableGeneratorInformix.java
Re-established console support with graceful failure.
Added 'dbms' to createProcedure refactoring.
CORE-1434
Formatted Changelog format not parsing UTF8 .sql files with BOM
Vagrant up starts successfully with mysql and postgres
Unzip needs to be installed in vagrant for oracle module
Handle SMMS generated views better
Add support of onFailMessage and onErrorMessage to changeSet and add support of onFail[Message] onError[Message] to changeLog
Vagrant is able to install oracle 12c
Added vagrant documentation files
Merge branch 'vagrant' into 3.0.x
add diffTypes as optional parameter to diff and diffToChangeLog, to
enable restricting the types of object being compared
multi-tenant spring integration with multiple data sources
* it reads JNDI subtree for all data sources
* wraps it in SpringLiquibase instances