significant refactor of ProfilingTools fixes #35 fixes #34 fixes #33

change log:
- exposed branch_length_function to Profile (defaults to 1/(depth in tree)
- added ability to not normalize the unifrac input vectors
- added better test data (that includes incorrectly formatted profiles)
- added test cases

data/small1.profile

@@ -5,9 +5,9 @@
 @TaxonomyID:ncbi-taxonomy_DATE
 @__program__:unknown
 @@TAXID	RANK	TAXPATH	TAXPATHSN	PERCENTAGE
-4	superkingdom	4	Archaea	0.029528
-5	superkingdom	5	Viruses	0.004334
-3	phylum	4|3	Archaea|Crenarchaeota	0.004226
-2	class	4||2	Archaea||ZZZ	0.004226
-1	class	4|3|1	Archaea|Crenarchaeota|Thermoprotei	0.004226
-0	strain	5||||0	Viruses||||Viruses strain	0.3908	Sample6_49	p0
+4	superkingdom	4	Archaea	80
+5	superkingdom	5	Viruses	20
+3	phylum	4|3	Archaea|Crenarchaeota	50
+2	class	4||2	Archaea||ZZZ	20
+1	class	4|3|1	Archaea|Crenarchaeota|Thermoprotei	50
+0	strain	5||||0	Viruses||||Viruses strain	20	Sample6_49	p0

data/small2.profile

@@ -5,9 +5,9 @@
 @TaxonomyID:ncbi-taxonomy_DATE
 @__program__:unknown
 @@TAXID	RANK	TAXPATH	TAXPATHSN	PERCENTAGE
-4	superkingdom	4	Archaea	0.029528
-5	superkingdom	5	Viruses	0.004334
-3	phylum	4|3	Archaea|Crenarchaeota	0.004226
-2	class	4||2	Archaea||ZZZ	0.004226
-1	class	4|3|1	Archaea|Crenarchaeota|Thermoprotei	0.004226
-0	strain	5|6|0|0|0	Viruses||||Viruses strain	0.3908	Sample6_49	p0
+4	superkingdom	4	Archaea	80
+5	superkingdom	5	Viruses	10
+3	phylum	4|3	Archaea|Crenarchaeota	50
+2	class	4||2	Archaea||ZZZ	20
+1	class	4|3|1	Archaea|Crenarchaeota|Thermoprotei	50
+0	strain	5|6|0|0|0	Viruses||||Viruses strain	10	Sample6_49	p0