Export cohorts to CSV

[keckelt]

closes https://github.com/Caleydo/cohort/issues/289

Adds button to download cohort data as CSV:

results in:

Id;Cohort;Age;Gender;Ethnicity
TCGA-ER-A3ES-01;(Tumortype: Skin cutaneous melanoma);25.00;male;not hispanic or latino
TCGA-W3-AA21-01;(Tumortype: Skin cutaneous melanoma);26.00;male;not hispanic or latino
TCGA-W3-AA21-06;(Tumortype: Skin cutaneous melanoma);26.00;male;not hispanic or latino
TCGA-ER-A3ES-06;(Tumortype: Skin cutaneous melanoma);25.00;male;not hispanic or latino
TCGA-DA-A1I5-01;(Tumortype: Skin cutaneous melanoma);27.00;female;not hispanic or latino
TCGA-WE-A8ZT-06;(Tumortype: Skin cutaneous melanoma);25.00;female;not hispanic or latino
TCGA-D3-A5GN-06;(Tumortype: Skin cutaneous melanoma);15.00;female;not hispanic or latino
TCGA-DA-A1I5-06;(Tumortype: Skin cutaneous melanoma);27.00;female;not hispanic or latino
TCGA-EE-A2MK-01;(Tumortype: Skin cutaneous melanoma);18.00;female;not hispanic or latino
TCGA-D3-A51J-06;(Tumortype: Skin cutaneous melanoma);19.00;male;not hispanic or latino
TCGA-EE-A2MK-06;(Tumortype: Skin cutaneous melanoma);18.00;female;not hispanic or latino
TCGA-EE-A3AG-06;(Tumortype: Skin cutaneous melanoma);25.00;male;not hispanic or latino
TCGA-EE-A3AG-01;(Tumortype: Skin cutaneous melanoma);25.00;male;not hispanic or latino
TCGA-D3-A5GR-06;(Tumortype: Skin cutaneous melanoma);23.00;female;not hispanic or latino
TCGA-FR-A44A-01;(Tumortype: Skin cutaneous melanoma);29.00;female;not hispanic or latino
TCGA-EE-A2MG-01;(Tumortype: Skin cutaneous melanoma);23.00;male;not hispanic or latino
TCGA-EE-A2MG-06;(Tumortype: Skin cutaneous melanoma);23.00;male;not hispanic or latino
...

[PatrickAdelberger]

okay 👍