convert_ensembl_id_to_name: Replace ensembl gene ids with gene names
In juliendelile/Antler: ANother Transcriptome Lineage ExploreR

When the dataset is loaded with genes specified by their ensembl ids, this function maps these ids to their associated gene names.

`biomart_dataset`	a character string specifying the BioMart dataset to use for the conversion. The list of available datasets can be listed with listDatasets from the "biomaRt" package. Default to 'mmusculus_gene_ensembl'.
`gene_ids_mapping_file`	a character string. If NULL, the conversion is performed from a gene ids/names mapping obtained using the biomaRt package (Default). This requires an internet connection. If not NULL, this argument must specify the location of a csv file with header containing the ensembl gene ids in the first column and the gene names in the second column.