Better PSR-4 support

Reduces directory paths to minimum possible.
Add $table parameter to factory method for select, insert, update, and delete
cleaner approach to injecting $table, add $columns/$values too
add test for select($table, $columns)
add test for insert($table, $values)
add test for update($table, $values)
Ignore the bin/ directory (from composer)
Merge pull request #33 from shadowhand/query-factory-with-tables

Add parameters to query factory methods
Merge pull request #34 from shadowhand/ignore-bin-directory

Ignore the bin/ directory (from composer)
Merging with @shadowhand
Merging with @shadowhand
Merging with @shadowhand
Merge branch 'correct-psr4-paths' of github.com:shadowhand/sql-query-builder into shadowhand-correct-psr4-paths
Merge branch 'shadowhand-correct-psr4-paths'
Simplify select($table) and join($table, ...)