Dev v2.4

[adamgayoso]

• Adds random state parameter for PCA, tSNE, synthetic doublet creation in BoostClassifer - closes #106
• Adds random state parameter for PCA, tSNE in tsne plot
• tsne plot returns PhenoGraph communities - closes #109
• tsne plot accepts array-like through sklearn check array - closes #104
• improves readability of threshold plot - closes #102
• notebook uses voter threshold of 0.8 (non-default)

[JonathanShor]

Also closes #105.