Merge branch 'release/0.3'

CHANGELOG.md

pom.xml

src/main/java/uk/ac/ed/pguaglia/real/Utils.java

src/main/java/uk/ac/ed/pguaglia/real/db/Database.java

src/main/java/uk/ac/ed/pguaglia/real/db/Schema.java

src/main/java/uk/ac/ed/pguaglia/real/db/SchemaException.java

...main/java/uk/ac/ed/pguaglia/real/lang/BaseExpression.java

src/main/java/uk/ac/ed/pguaglia/real/lang/BaseRelation.java

...ain/java/uk/ac/ed/pguaglia/real/lang/BinaryOperation.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Condition.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Distinct.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Expression.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Negation.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Product.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Projection.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Renaming.java

src/main/java/uk/ac/ed/pguaglia/real/lang/Selection.java

...ain/java/uk/ac/ed/pguaglia/real/parsing/RealListener.java

...n/java/uk/ac/ed/pguaglia/real/runtime/CommandLineApp.java

...n/java/uk/ac/ed/pguaglia/real/runtime/DataFileFilter.java