Fixes #1: SQL execution failure in "Execute SQL from File" now lets
SQLException pop out.
Fixed system.out message with failing Sql statement (as it was empty).
Added tests for "Execute SQL from File" keyword.
Fixed #3: No separation character added when SQL statment spans multiple
lines (in files for "Execute SQL from File")
Merge branch 'hotfixes' into develop

Conflicts:
	dblibrary/src/main/java/org/robot/database/keywords/DatabaseLibrary.java
	dblibrary/src/test/java/org/robot/database/keywords/test/DatabaseLibraryTest.java