Looping checks rather than fixed delays

[AlexanderPico]

Per Barry's suggestion, we could check for certain events or changes to complete before proceeding instead of relying on the hard-coded delays which are not optimized per use case.

Might borrow ideas from here to construct the looping checks: http://bioconductor.org/developers/how-to/web-query/

[AlexanderPico]

Might also include setters for the delay values, like Barry did for py4cy:

def set_catchup_filter_secs(delay_secs):
    CATCHUP_FILTER_SECS = delay_secs

def set_model_propagation_secs(delay_secs):
    MODEL_PROPAGATION_SECS = delay_secs

def set_catchup_network_secs(delay_secs):
    CATCHUP_NETWORK_SECS = delay_secs

def set_ndex_delay_secs(delay_secs):
    NDEX_DELAY_SECS = delay_secs

[bdemchak]

Looping checks rather than fixed delays #101

[AlexanderPico]

Removed NDEx delays (like in py4cy) and added setter methods in RCy3.R using custom package environment, RCy3env.