Partial Implementation of setShape for Slice.
Merge branch 'master' of
https://github.com/TryLi/uk.ac.diamond.scisoft.analysis.lazyeval.git

Conflicts:
	uk.ac.diamond.scisoft.analysis.lazyeval/src/uk/ac/diamond/scisoft/analysis/lazyeval/LazyDataset.java
	uk.ac.diamond.scisoft.analysis.lazyeval/src/uk/ac/diamond/scisoft/analysis/lazyeval/Slice.java